Merge pull request #5102 from...

Merge pull request #5102 from taosdata/hotfix/sangshuduo/TD-2901-csharp-taosdemo-with-mono-doesnot-exit

[TD-2901] <fix>: fix bug taosdemo with mono compiled does not exit.

tests/examples/C#/taosdemo/taosdemo.cs

@@ -650,6 +650,7 @@ namespace TDengineDriver
             tester.CloseConnection();
 
             Console.WriteLine("End.");
+            CleanAndExitProgram(0);
         }
 
         public class InsertDataThread