diff --git a/c#/StringHas.cs b/c#/StringHas.cs
new file mode 100644
index 0000000000000000000000000000000000000000..f745f0ccfedb3c5632542cc739f688b11e472dd8
--- /dev/null
+++ b/c#/StringHas.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace C_Sharp
+{
+   public class StringHas
+    {
+       
+        /// <summary>
+        /// 错误判断
+        /// </summary>
+        /// <param name="str"></param>
+        /// <returns></returns>
+        private bool StringHasF(string str)
+        {
+            if (str==null&&str=="")
+            {
+                return false;
+            }
+            return true;
+        }
+        /// <summary>
+        /// 正确的判断
+        /// </summary>
+        /// <param name="str"></param>
+        /// <returns></returns>
+        private bool StringHasT(string str)
+        {
+            return string.IsNullOrEmpty(str);
+        }
+
+    }
+}
\ No newline at end of file