diff --git a/tests/connectorTest/C#Test/nanosupport/nanotest.cs b/tests/connectorTest/C#Test/nanosupport/nanotest.cs
index 666c731e3a88feb727ff9ea0f84111ae36bd211e..4232b0b6d994e5f71e7c7b2fbcc2fa5e425e45a5 100644
--- a/tests/connectorTest/C#Test/nanosupport/nanotest.cs
+++ b/tests/connectorTest/C#Test/nanosupport/nanotest.cs
@@ -443,6 +443,7 @@ namespace TDengineDriver
 
         public void cleanup()
         {
+            TDengine.Cleanup();
             Console.WriteLine("clean up...");
             System.Environment.Exit(0);
         }