diff --git a/problems/0344.反转字符串.md b/problems/0344.反转字符串.md
index 9176c915..920cd86c 100644
--- a/problems/0344.反转字符串.md
+++ b/problems/0344.反转字符串.md
@@ -232,6 +232,19 @@ void reverseString(char* s, int sSize){
 }
 ```
 
+C#：
+```csharp
+public class Solution
+{
+    public void ReverseString(char[] s)
+    {
+        for (int i = 0, j = s.Length - 1; i < j; i++, j--)
+        {
+            (s[i], s[j]) = (s[j], s[i]);
+        }
+    }
+}
+```
 
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 <div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>