Update 0494.目标和，添加C#

problems/0494.目标和.md

@@ -585,6 +585,33 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int FindTargetSumWays(int[] nums, int target)
+    {
+        int sum = 0;
+        foreach (int num in nums)
+        {
+            sum += num;
+        }
+        if (Math.Abs(target) > sum) return 0;
+        if ((sum + target) % 2 == 1) return 0;
+        int bagSize = (sum + target) / 2;
+        int[] dp = new int[bagSize + 1];
+        dp[0] = 1;
+        for (int i = 0; i < nums.Length; i++)
+        {
+            for (int j = bagSize; j >= nums[i]; j--)
+            {
+                dp[j] += dp[j - nums[i]];
+            }
+        }
+        return dp[bagSize];
+    }
+}
+```
 
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