diff --git a/examples/C#/taosdemo/taosdemo.cs b/examples/C#/taosdemo/taosdemo.cs
index 1d7fd316f8929f88edb8421d6a2f6976d64648c4..a48439d192bb5dfcd0083f27abb258ece0f4f28d 100644
--- a/examples/C#/taosdemo/taosdemo.cs
+++ b/examples/C#/taosdemo/taosdemo.cs
@@ -305,7 +305,7 @@ namespace TDengineDriver
             this.conn = TDengine.Connect(this.host, this.user, this.password, db, this.port);
             if (this.conn == IntPtr.Zero)
             {
-                Console.WriteLine("Connect to TDengine failed");
+                Console.WriteLine("Connect to TDengine failed. Reason: {0}\n", TDengine.Error(0));
                 CleanAndExitProgram(1);
             }
             else