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Update C# documentation after C# source move (#1067)

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@ -33,7 +33,6 @@ Learn more
- [C++]({{< relref "/docs/languages/cpp/quickstart" >}})
- [Java]({{< relref "/docs/languages/java/quickstart" >}})
- [Python]({{< relref "/docs/languages/python/quickstart" >}})
- [C#]({{< relref "/docs/languages/csharp/quickstart" >}})
- [<i class="fas fa-ellipsis-h" aria-label="Supported languages"></i>]({{< relref "languages" >}})
</div>
{{< /blocks/cover >}}

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@ -302,50 +302,6 @@ std::unique_ptr<Greeter::Stub> stub(Greeter::NewStub(channel));
...
```
#### C# {#csharp}
##### Base case - no encryption or authentication
```csharp
var channel = new Channel("localhost:50051", ChannelCredentials.Insecure);
var client = new Greeter.GreeterClient(channel);
...
```
##### With server authentication SSL/TLS
```csharp
var channelCredentials = new SslCredentials(File.ReadAllText("roots.pem")); // Load a custom roots file.
var channel = new Channel("myservice.example.com", channelCredentials);
var client = new Greeter.GreeterClient(channel);
```
##### Authenticate with Google
```csharp
using Grpc.Auth; // from Grpc.Auth NuGet package
...
// Loads Google Application Default Credentials with publicly trusted roots.
var channelCredentials = await GoogleGrpcCredentials.GetApplicationDefaultAsync();
var channel = new Channel("greeter.googleapis.com", channelCredentials);
var client = new Greeter.GreeterClient(channel);
...
```
##### Authenticate a single RPC call
```csharp
var channel = new Channel("greeter.googleapis.com", new SslCredentials()); // Use publicly trusted roots.
var client = new Greeter.GreeterClient(channel);
...
var googleCredential = await GoogleCredential.GetApplicationDefaultAsync();
var result = client.SayHello(request, new CallOptions(credentials: googleCredential.ToCallCredentials()));
...
```
#### Python
##### Base case - No encryption or authentication

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---
title: C#
description: The original core-library implementation of gRPC for C#
title: C# / .NET
api_path: grpc/LANG/api/Grpc.Core
prog_lang_home: true
src_repo: https://github.com/grpc/grpc
content:
- learn_more:
- "[Additional docs]($src_repo_url/tree/master/doc/csharp)"
- "[Examples]($src_repo_url/tree/master/examples/csharp)"
- reference:
- "[API](api/)"
- other:
- "[gRPC for .NET](dotnet/)"
- "[grpc repo]($src_repo_url)"
- "[Daily builds](daily-builds)"
cascade:
- show_banner: true
---
{{% docs/prog-lang-home-content %}}
*This page used to contain the documentation for the original C# implementation
of gRPC based on the native gRPC Core library (i.e. `Grpc.Core` nuget package).
The implementation is currently in maintenance mode and its source code has
been [moved][move-details]. We plan to deprecate
the implementation in the future (see [blogpost][]) and we recommend that
all users use the [grpc-dotnet][] implementation instead.*
The following pages cover the C# implementation of gRPC for .NET
([grpc-dotnet][]):
- [Introduction to gRPC on .NET Core](https://docs.microsoft.com/aspnet/core/grpc)
- [Tutorial: Create a gRPC client and server in ASP.NET Core][tutorial]
Several sample applications are available from the [examples][] folder in the
[grpc-dotnet][] repository.
[move-details]: https://github.com/grpc/grpc/blob/master/src/csharp/README.md
[examples]: https://github.com/grpc/grpc-dotnet/tree/master/examples
[grpc-dotnet]: https://github.com/grpc/grpc-dotnet
[tutorial]: https://docs.microsoft.com/aspnet/core/tutorials/grpc/grpc-start
[blogpost]: https://grpc.io/blog/grpc-csharp-future/

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---
title: API reference
linkTitle: API
title: API reference (legacy Grpc.Core only)
linkTitle: API (legacy)
weight: 90
# Note: this is a placeholder page. The URL to this page redirects elsewhere.
manualLinkTarget: _blank

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---
title: Basics tutorial
description: A basic tutorial introduction to gRPC in C#.
weight: 50
---
This tutorial provides a basic C# programmer's introduction to working with gRPC.
By walking through this example you'll learn how to:
- Define a service in a .proto file.
- Generate server and client code using the protocol buffer compiler.
- Use the C# gRPC API to write a simple client and server for your service.
It assumes that you have read the [Introduction to gRPC](/docs/what-is-grpc/introduction/) and are familiar
with [protocol buffers](https://developers.google.com/protocol-buffers/docs/overview). Note that the
example in this tutorial uses the proto3 version of the protocol buffers
language: you can find out more in the
[proto3 language guide](https://developers.google.com/protocol-buffers/docs/proto3) and
[C# generated code reference](https://developers.google.com/protocol-buffers/docs/reference/csharp-generated).
### Why use gRPC?
{{< why-grpc >}}
### Example code and setup
The example code for our tutorial is in
[grpc/grpc/examples/csharp/RouteGuide](https://github.com/grpc/grpc/tree/{{< param grpc_vers.core >}}/examples/csharp/RouteGuide). To
download the example, clone the `grpc` repository by running the following
command:
```sh
$ git clone -b {{< param grpc_vers.core >}} --depth 1 --shallow-submodules https://github.com/grpc/grpc
$ cd grpc
```
All the files for this tutorial are in the directory
`examples/csharp/RouteGuide`. Open the solution
`examples/csharp/RouteGuide/RouteGuide.sln` from Visual Studio (Windows or Mac) or Visual Studio Code.
For additional installation details, see the [How to use
instructions](https://github.com/grpc/grpc/tree/{{< param grpc_vers.core >}}/src/csharp#how-to-use).
### Defining the service
Our first step (as you'll know from the [Introduction to gRPC](/docs/what-is-grpc/introduction/)) is to
define the gRPC *service* and the method *request* and *response* types using
[protocol buffers](https://developers.google.com/protocol-buffers/docs/overview).
You can see the complete .proto file in
[`examples/protos/route_guide.proto`](https://github.com/grpc/grpc/blob/{{< param grpc_vers.core >}}/examples/protos/route_guide.proto).
To define a service, you specify a named `service` in your .proto file:
```protobuf
service RouteGuide {
...
}
```
Then you define `rpc` methods inside your service definition, specifying their
request and response types. gRPC lets you define four kinds of service method,
all of which are used in the `RouteGuide` service:
- A *simple RPC* where the client sends a request to the server using the client
object and waits for a response to come back, just like a normal function
call.
```protobuf
// Obtains the feature at a given position.
rpc GetFeature(Point) returns (Feature) {}
```
- A *server-side streaming RPC* where the client sends a request to the server
and gets a stream to read a sequence of messages back. The client reads from
the returned stream until there are no more messages. As you can see in our
example, you specify a server-side streaming method by placing the `stream`
keyword before the *response* type.
```protobuf
// Obtains the Features available within the given Rectangle. Results are
// streamed rather than returned at once (e.g. in a response message with a
// repeated field), as the rectangle may cover a large area and contain a
// huge number of features.
rpc ListFeatures(Rectangle) returns (stream Feature) {}
```
- A *client-side streaming RPC* where the client writes a sequence of messages
and sends them to the server, again using a provided stream. Once the client
has finished writing the messages, it waits for the server to read them all
and return its response. You specify a client-side streaming method by placing
the `stream` keyword before the *request* type.
```protobuf
// Accepts a stream of Points on a route being traversed, returning a
// RouteSummary when traversal is completed.
rpc RecordRoute(stream Point) returns (RouteSummary) {}
```
- A *bidirectional streaming RPC* where both sides send a sequence of messages
using a read-write stream. The two streams operate independently, so clients
and servers can read and write in whatever order they like: for example, the
server could wait to receive all the client messages before writing its
responses, or it could alternately read a message then write a message, or
some other combination of reads and writes. The order of messages in each
stream is preserved. You specify this type of method by placing the `stream`
keyword before both the request and the response.
```protobuf
// Accepts a stream of RouteNotes sent while a route is being traversed,
// while receiving other RouteNotes (e.g. from other users).
rpc RouteChat(stream RouteNote) returns (stream RouteNote) {}
```
Our `.proto` file also contains protocol buffer message type definitions for all
the request and response types used in our service methods - for example, here's
the `Point` message type:
```protobuf
// Points are represented as latitude-longitude pairs in the E7 representation
// (degrees multiplied by 10**7 and rounded to the nearest integer).
// Latitudes should be in the range +/- 90 degrees and longitude should be in
// the range +/- 180 degrees (inclusive).
message Point {
int32 latitude = 1;
int32 longitude = 2;
}
```
### Generating client and server code
Next we need to generate the gRPC client and server interfaces from our .proto
service definition. This can be done by invoking the protocol buffer compiler `protoc` with
a special gRPC C# plugin from the command line, but starting from version
1.17 the `Grpc.Tools` NuGet package integrates with MSBuild to provide [automatic C# code generation](https://github.com/grpc/grpc/blob/master/src/csharp/BUILD-INTEGRATION.md)
from `.proto` files, which gives much better developer experience by running
the right commands for you as part of the build.
This example already has a dependency on `Grpc.Tools` NuGet package and the
`route_guide.proto` has already been added to the project, so the only thing
needed to generate the client and server code is to build the solution.
That can be done by running `dotnet build RouteGuide.sln` or building directly
in Visual Studio.
The build regenerates the following files
under the `RouteGuide/obj/Debug/TARGET_FRAMEWORK` directory:
- `RouteGuide.cs` contains all the protocol buffer code to populate,
serialize, and retrieve our request and response message types
- `RouteGuideGrpc.cs` provides generated client and server classes,
including:
- an abstract class `RouteGuide.RouteGuideBase` to inherit from when defining
RouteGuide service implementations
- a class `RouteGuide.RouteGuideClient` that can be used to access remote
RouteGuide instances
### Creating the server {#server}
First let's look at how we create a `RouteGuide` server. If you're only
interested in creating gRPC clients, you can skip this section and go straight
to [Creating the client](#client) (though you might find it interesting
anyway!).
There are two parts to making our `RouteGuide` service do its job:
- Implementing the service functionality by inheriting from the base class
generated from our service definition: doing the actual "work" of our service.
- Running a gRPC server to listen for requests from clients and return the
service responses.
You can find our example `RouteGuide` server in
[examples/csharp/RouteGuide/RouteGuideServer/RouteGuideImpl.cs](https://github.com/grpc/grpc/blob/{{< param grpc_vers.core >}}/examples/csharp/RouteGuide/RouteGuideServer/RouteGuideImpl.cs).
Let's take a closer look at how it works.
#### Implementing RouteGuide
As you can see, our server has a `RouteGuideImpl` class that inherits from the
generated `RouteGuide.RouteGuideBase`:
```csharp
// RouteGuideImpl provides an implementation of the RouteGuide service.
public class RouteGuideImpl : RouteGuide.RouteGuideBase
```
##### Simple RPC
`RouteGuideImpl` implements all our service methods. Let's look at the simplest
type first, `GetFeature`, which just gets a `Point` from the client and returns
the corresponding feature information from its database in a `Feature`.
```csharp
public override Task<Feature> GetFeature(Point request, Grpc.Core.ServerCallContext context)
{
return Task.FromResult(CheckFeature(request));
}
```
The method is passed a context for the RPC (which is empty in the alpha
release), the client's `Point` protocol buffer request, and returns a `Feature`
protocol buffer. In the method we create the `Feature` with the appropriate
information, and then return it. To allow asynchronous implementation, the
method returns `Task<Feature>` rather than just `Feature`. You are free to
perform your computations synchronously and return the result once you've
finished, just as we do in the example.
##### Server-side streaming RPC
Now let's look at something a bit more complicated - a streaming RPC.
`ListFeatures` is a server-side streaming RPC, so we need to send back multiple
`Feature` protocol buffers to our client.
```csharp
// in RouteGuideImpl
public override async Task ListFeatures(Rectangle request,
Grpc.Core.IServerStreamWriter<Feature> responseStream,
Grpc.Core.ServerCallContext context)
{
var responses = features.FindAll( (feature) => feature.Exists() && request.Contains(feature.Location) );
foreach (var response in responses)
{
await responseStream.WriteAsync(response);
}
}
```
As you can see, here the request object is a `Rectangle` in which our client
wants to find `Feature`s, but instead of returning a simple response we need to
write responses to an asynchronous stream `IServerStreamWriter` using async
method `WriteAsync`.
##### Client-side streaming RPC
Similarly, the client-side streaming method `RecordRoute` uses an
[IAsyncEnumerator](https://github.com/Reactive-Extensions/Rx.NET/blob/master/Ix.NET/Source/System.Interactive.Async/IAsyncEnumerator.cs),
to read the stream of requests using the async method `MoveNext` and the
`Current` property.
```csharp
public override async Task<RouteSummary> RecordRoute(Grpc.Core.IAsyncStreamReader<Point> requestStream,
Grpc.Core.ServerCallContext context)
{
int pointCount = 0;
int featureCount = 0;
int distance = 0;
Point previous = null;
var stopwatch = new Stopwatch();
stopwatch.Start();
while (await requestStream.MoveNext())
{
var point = requestStream.Current;
pointCount++;
if (CheckFeature(point).Exists())
{
featureCount++;
}
if (previous != null)
{
distance += (int) previous.GetDistance(point);
}
previous = point;
}
stopwatch.Stop();
return new RouteSummary
{
PointCount = pointCount,
FeatureCount = featureCount,
Distance = distance,
ElapsedTime = (int)(stopwatch.ElapsedMilliseconds / 1000)
};
}
```
##### Bidirectional streaming RPC
Finally, let's look at our bidirectional streaming RPC `RouteChat`.
```csharp
public override async Task RouteChat(Grpc.Core.IAsyncStreamReader<RouteNote> requestStream,
Grpc.Core.IServerStreamWriter<RouteNote> responseStream,
Grpc.Core.ServerCallContext context)
{
while (await requestStream.MoveNext())
{
var note = requestStream.Current;
List<RouteNote> prevNotes = AddNoteForLocation(note.Location, note);
foreach (var prevNote in prevNotes)
{
await responseStream.WriteAsync(prevNote);
}
}
}
```
Here the method receives both `requestStream` and `responseStream` arguments.
Reading the requests is done the same way as in the client-side streaming method
`RecordRoute`. Writing the responses is done the same way as in the server-side
streaming method `ListFeatures`.
#### Starting the server
Once we've implemented all our methods, we also need to start up a gRPC server
so that clients can actually use our service. The following snippet shows how we
do this for our `RouteGuide` service:
```csharp
var features = RouteGuideUtil.LoadFeatures();
Server server = new Server
{
Services = { RouteGuide.BindService(new RouteGuideImpl(features)) },
Ports = { new ServerPort("localhost", Port, ServerCredentials.Insecure) }
};
server.Start();
Console.WriteLine("RouteGuide server listening on port " + port);
Console.WriteLine("Press any key to stop the server...");
Console.ReadKey();
server.ShutdownAsync().Wait();
```
As you can see, we build and start our server using `Grpc.Core.Server` class. To
do this, we:
1. Create an instance of `Grpc.Core.Server`.
1. Create an instance of our service implementation class `RouteGuideImpl`.
1. Register our service implementation by adding its service definition to the
`Services` collection (We obtain the service definition from the generated
`RouteGuide.BindService` method).
1. Specify the address and port we want to use to listen for client requests.
This is done by adding `ServerPort` to the `Ports` collection.
1. Call `Start` on the server instance to start an RPC server for our service.
### Creating the client {#client}
In this section, we'll look at creating a C# client for our `RouteGuide`
service. You can see our complete example client code in
[examples/csharp/RouteGuide/RouteGuideClient/Program.cs](https://github.com/grpc/grpc/blob/{{< param grpc_vers.core >}}/examples/csharp/RouteGuide/RouteGuideClient/Program.cs).
#### Creating a client object
To call service methods, we first need to create a client object (also referred
to as *stub* for other gRPC languages).
First, we need to create a gRPC client channel that will connect to gRPC server.
Then, we create an instance of the `RouteGuide.RouteGuideClient` class generated
from our .proto, passing the channel as an argument.
```csharp
Channel channel = new Channel("127.0.0.1:50052", ChannelCredentials.Insecure);
var client = new RouteGuide.RouteGuideClient(channel);
// YOUR CODE GOES HERE
channel.ShutdownAsync().Wait();
```
#### Calling service methods
Now let's look at how we call our service methods. gRPC C# provides asynchronous
versions of each of the supported method types. For convenience, gRPC C# also
provides a synchronous method stub, but only for simple (single request/single
response) RPCs.
##### Simple RPC
Calling the simple RPC `GetFeature` in a synchronous way is nearly as
straightforward as calling a local method.
```csharp
Point request = new Point { Latitude = 409146138, Longitude = -746188906 };
Feature feature = client.GetFeature(request);
```
As you can see, we create and populate a request protocol buffer object (in our
case `Point`), and call the desired method on the client object, passing it the
request. If the RPC finishes with success, the response protocol buffer (in our
case `Feature`) is returned. Otherwise, an exception of type `RpcException` is
thrown, indicating the status code of the problem.
Alternatively, if you are in an async context, you can call an asynchronous
version of the method and use the `await` keyword to await the result:
```csharp
Point request = new Point { Latitude = 409146138, Longitude = -746188906 };
Feature feature = await client.GetFeatureAsync(request);
```
##### Streaming RPCs
Now let's look at our streaming methods. If you've already read [Creating the
server](#server) some of this may look very familiar - streaming RPCs are
implemented in a similar way on both sides. The difference with respect to
simple call is that the client methods return an instance of a call object. This
provides access to request/response streams and/or the asynchronous result,
depending on the streaming type you are using.
Here's where we call the server-side streaming method `ListFeatures`, which has
the property `ReponseStream` of type `IAsyncEnumerator<Feature>`
```csharp
using (var call = client.ListFeatures(request))
{
while (await call.ResponseStream.MoveNext())
{
Feature feature = call.ResponseStream.Current;
Console.WriteLine("Received " + feature.ToString());
}
}
```
The client-side streaming method `RecordRoute` is similar, except we use the
property `RequestStream` to write the requests one by one using `WriteAsync`,
and eventually signal that no more requests will be sent using `CompleteAsync`.
The method result can be obtained through the property `ResponseAsync`.
```csharp
using (var call = client.RecordRoute())
{
foreach (var point in points)
{
await call.RequestStream.WriteAsync(point);
}
await call.RequestStream.CompleteAsync();
RouteSummary summary = await call.ResponseAsync;
}
```
Finally, let's look at our bidirectional streaming RPC `RouteChat`. In this
case, we write the request to `RequestStream` and receive the responses from
`ResponseStream`. As you can see from the example, the streams are independent
of each other.
```csharp
using (var call = client.RouteChat())
{
var responseReaderTask = Task.Run(async () =>
{
while (await call.ResponseStream.MoveNext())
{
var note = call.ResponseStream.Current;
Console.WriteLine("Received " + note);
}
});
foreach (RouteNote request in requests)
{
await call.RequestStream.WriteAsync(request);
}
await call.RequestStream.CompleteAsync();
await responseReaderTask;
}
```
### Try it out!
Build the client and server:
Using Visual Studio (or Visual Studio For Mac)
: Open the solution `examples/csharp/RouteGuide/RouteGuide.sln` and select **Build**.
Using `dotnet` command line tool
: Run `dotnet build RouteGuide.sln` from the `examples/csharp/RouteGuide`
directory. For additional instructions on building the gRPC example with the
`dotnet` command line tool, see [Quick start](../quickstart/).
Run the server:
```sh
> cd RouteGuideServer
> dotnet run
```
From a different terminal, run the client:
```sh
> cd RouteGuideClient
> dotnet run
```
You can also run the server and client directly from Visual Studio.

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---
title: Daily builds
title: Daily builds (Grpc.Tools nuget only)
linkTitle: Daily builds (legacy)
robots: noindex, nofollow
weight: 90
# Note: this is a placeholder page. The URL to this page redirects elsewhere.

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---
title: gRPC for .NET
weight: 60
---
The following pages cover the C# implementation of gRPC for .NET
([grpc-dotnet][]):
- [Introduction to gRPC on .NET Core](https://docs.microsoft.com/aspnet/core/grpc)
- [Tutorial: Create a gRPC client and server in ASP.NET Core][tutorial]
- [API reference](api/)
Several sample applications are available from the [examples][] folder in the
[grpc-dotnet][] repository.
{{% alert title="Note" color="info" %}}
Looking for gRPC C# core-library documentation?
See the [gRPC C# main page](..).
{{% /alert %}}
[examples]: https://github.com/grpc/grpc-dotnet/tree/master/examples
[grpc-dotnet]: https://github.com/grpc/grpc-dotnet
[tutorial]: https://docs.microsoft.com/aspnet/core/tutorials/grpc/grpc-start

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---
title: Quick start
description: This guide gets you started with gRPC in C# with a simple working example.
weight: 10
---
{{% alert title="Note" color="info" %}}
This page uses the [gRPC C# core-library][core-library] implementation. For
documentation covering gRPC for .NET, see [gRPC for .NET](../dotnet/).
[core-library]: https://github.com/grpc/grpc/tree/master/src/csharp
{{% /alert %}}
### Prerequisites
Whether you're using Windows, OS X, or Linux, you can follow this
example by using either an IDE and its build tools,
or by using the the .NET Core SDK command line tools.
First, make sure you have installed the
[gRPC C# prerequisites](https://github.com/grpc/grpc/blob/{{< param grpc_vers.core >}}/src/csharp/README.md#prerequisites).
You will also need Git to download the sample code.
### Download the example
You'll need a local copy of the example code to work through this quick start.
Download the example code from our GitHub repository (the following command
clones the entire repository, but you just need the examples for this quick start
and other tutorials):
```sh
# Clone the repository to get the example code:
$ git clone -b {{< param grpc_vers.core >}} --depth 1 --shallow-submodules https://github.com/grpc/grpc
$ cd grpc
```
This document will walk you through the "Hello World" example.
The projects and source files can be found in the `examples/csharp/Helloworld` directory.
The example in this walkthrough already adds the necessary
dependencies for you (`Grpc`, `Grpc.Tools` and `Google.Protobuf` NuGet packages).
### Build the example
#### Using Visual Studio (or Visual Studio for Mac)
* Open the solution `Greeter.sln` with Visual Studio
* Build the solution
#### Using .NET Core SDK from the command line
From the `examples/csharp/Helloworld` directory:
```sh
> dotnet build Greeter.sln
```
### Run a gRPC application
From the `examples/csharp/Helloworld` directory:
* Run the server:
```sh
> cd GreeterServer
> dotnet run -f netcoreapp2.1
```
* From another terminal, run the client:
```sh
> cd GreeterClient
> dotnet run -f netcoreapp2.1
```
Congratulations! You've just run a client-server application with gRPC.
### Update the gRPC service
Now let's look at how to update the application with an extra method on the
server for the client to call. Our gRPC service is defined using protocol
buffers; you can find out lots more about how to define a service in a `.proto`
file in [Basics tutorial](../basics/). For now all you need to know is that both the
server and the client "stub" have a `SayHello` RPC method that takes a
`HelloRequest` parameter from the client and returns a `HelloResponse` from the
server, and that this method is defined like this:
```proto
// The greeting service definition.
service Greeter {
// Sends a greeting
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
// The request message containing the user's name.
message HelloRequest {
string name = 1;
}
// The response message containing the greetings
message HelloReply {
string message = 1;
}
```
Let's update this so that the `Greeter` service has two methods. Edit
`examples/protos/helloworld.proto` and update it with a new `SayHelloAgain`
method, with the same request and response types:
```proto
// The greeting service definition.
service Greeter {
// Sends a greeting
rpc SayHello (HelloRequest) returns (HelloReply) {}
// Sends another greeting
rpc SayHelloAgain (HelloRequest) returns (HelloReply) {}
}
// The request message containing the user's name.
message HelloRequest {
string name = 1;
}
// The response message containing the greetings
message HelloReply {
string message = 1;
}
```
Remember to save the file!
### Generate gRPC code
Next we need to update the gRPC code used by our application to use the new service definition.
The `Grpc.Tools` NuGet package contains the protoc and protobuf C# plugin binaries needed
to generate the code. Starting from version 1.17 the package also integrates with
MSBuild to provide [automatic C# code generation](https://github.com/grpc/grpc/blob/master/src/csharp/BUILD-INTEGRATION.md)
from `.proto` files.
This example project already depends on the `Grpc.Tools.{{< psubstr grpc_vers.core 1 >}}` NuGet package so just re-building the solution
is enough to regenerate the code from our modified `.proto` file.
You can rebuild just like we first built the original
example by running `dotnet build Greeter.sln` or by clicking "Build" in Visual Studio.
The build regenerates the following files
under the `Greeter/obj/Debug/TARGET_FRAMEWORK` directory:
* `Helloworld.cs` contains all the protocol buffer code to populate,
serialize, and retrieve our request and response message types
* `HelloworldGrpc.cs` provides generated client and server classes,
including:
* an abstract class `Greeter.GreeterBase` to inherit from when defining
Greeter service implementations
* a class `Greeter.GreeterClient` that can be used to access remote Greeter
instances
### Update and run the application
We now have new generated server and client code, but we still need to implement
and call the new method in the human-written parts of our example application.
#### Update the server
With the `Greeter.sln` open in your IDE, open `GreeterServer/Program.cs`.
Implement the new method by editing the GreeterImpl class like this:
```C#
class GreeterImpl : Greeter.GreeterBase
{
// Server side handler of the SayHello RPC
public override Task<HelloReply> SayHello(HelloRequest request, ServerCallContext context)
{
return Task.FromResult(new HelloReply { Message = "Hello " + request.Name });
}
// Server side handler for the SayHelloAgain RPC
public override Task<HelloReply> SayHelloAgain(HelloRequest request, ServerCallContext context)
{
return Task.FromResult(new HelloReply { Message = "Hello again " + request.Name });
}
}
```
#### Update the client
With the same `Greeter.sln` open in your IDE, open `GreeterClient/Program.cs`.
Call the new method like this:
```C#
public static void Main(string[] args)
{
Channel channel = new Channel("127.0.0.1:50051", ChannelCredentials.Insecure);
var client = new Greeter.GreeterClient(channel);
String user = "you";
var reply = client.SayHello(new HelloRequest { Name = user });
Console.WriteLine("Greeting: " + reply.Message);
var secondReply = client.SayHelloAgain(new HelloRequest { Name = user });
Console.WriteLine("Greeting: " + secondReply.Message);
channel.ShutdownAsync().Wait();
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
```
#### Rebuild the modified example
Rebuild the newly modified example just like we first built the original
example by running `dotnet build Greeter.sln` or by clicking "Build" in Visual Studio.
#### Run!
Just like we did before, from the `examples/csharp/Helloworld` directory:
1. Run the server:
```sh
> cd GreeterServer
> dotnet run -f netcoreapp2.1
```
2. From another terminal, run the client:
```sh
> cd GreeterClient
> dotnet run -f netcoreapp2.1
```
### What's next
- Learn how gRPC works in [Introduction to gRPC](/docs/what-is-grpc/introduction/)
and [Core concepts](/docs/what-is-grpc/core-concepts/).
- Work through the [Basics tutorial](../basics/)
- Explore the [API reference](../api).

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# C# .NET
/docs/languages/csharp/dotnet/api https://grpc.github.io/grpc/csharp-dotnet/api/Grpc.Core
/docs/languages/csharp/quickstart /docs/languages/csharp
/docs/languages/csharp/basics /docs/languages/csharp
/docs/languages/csharp/dotnet /docs/languages/csharp
#
# Daily-build pages:
@ -58,8 +61,8 @@
/docs/guides/concepts* /docs/what-is-grpc/core-concepts
/docs/guides/contributing /community
/docs/languages/csharp/quickstart-dotnet /docs/languages/csharp/dotnet
/docs/quickstart/csharp-dotnet /docs/languages/csharp/dotnet
/docs/languages/csharp/quickstart-dotnet /docs/languages/csharp
/docs/quickstart/csharp-dotnet /docs/languages/csharp
/docs/reference /docs/languages
/docs/samples /docs/languages
/docs/tutorials/async/helloasync-cpp* /docs/languages/cpp/async