diff --git a/docs/examples/csharp/wsConnect/Program.cs b/docs/examples/csharp/wsConnect/Program.cs
index f9a56c842f..a534bb8a65 100644
--- a/docs/examples/csharp/wsConnect/Program.cs
+++ b/docs/examples/csharp/wsConnect/Program.cs
@@ -5,22 +5,24 @@ namespace Examples
 {
     public class WSConnExample
     {
-        static void Main(string[] args)
+        static int Main(string[] args)
         {
             string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
             IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
   
             if (wsConn == IntPtr.Zero)
             {
-                throw new Exception("get WS connection failed");
+                Console.WriteLine("get WS connection failed");
+                return -1;
             }
             else
             {
                 Console.WriteLine("Establish connect success.");
+                // close connection.
+                LibTaosWS.WSClose(wsConn);
             }
 
-            // close connection.
-            LibTaosWS.WSClose(wsConn);
+            return 0;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/docs/examples/csharp/wsInsert/Program.cs b/docs/examples/csharp/wsInsert/Program.cs
index 1f2d0a6725..7fa6af805c 100644
--- a/docs/examples/csharp/wsInsert/Program.cs
+++ b/docs/examples/csharp/wsInsert/Program.cs
@@ -5,7 +5,7 @@ namespace Examples
 {
     public class WSInsertExample
     {
-        static void Main(string[] args)
+        static int Main(string[] args)
         {
             string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
             IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
@@ -13,7 +13,8 @@ namespace Examples
             // Assert if connection is validate
             if (wsConn == IntPtr.Zero)
             {
-                throw new Exception("get WS connection failed");
+                Console.WriteLine("get WS connection failed");
+                return -1;
             }
             else
             {
@@ -36,6 +37,8 @@ namespace Examples
 
             // close connection.
             LibTaosWS.WSClose(wsConn);
+
+            return 0;
         }
 
         static void ValidInsert(string desc, IntPtr wsRes)
@@ -43,7 +46,7 @@ namespace Examples
             int code = LibTaosWS.WSErrorNo(wsRes);
             if (code != 0)
             {
-                throw new Exception($"execute SQL failed: reason: {LibTaosWS.WSErrorStr(wsRes)}, code:{code}");
+                Console.WriteLine($"execute SQL failed: reason: {LibTaosWS.WSErrorStr(wsRes)}, code:{code}");
             }
             else
             {
@@ -55,4 +58,4 @@ namespace Examples
 }
 // Establish connect success.
 // create table success affect 0 rows, cost 3717542 nanoseconds
-// insert data success affect 8 rows, cost 2613637 nanoseconds
\ No newline at end of file
+// insert data success affect 8 rows, cost 2613637 nanoseconds
diff --git a/docs/examples/csharp/wsQuery/Program.cs b/docs/examples/csharp/wsQuery/Program.cs
index a220cae903..8ee900a05a 100644
--- a/docs/examples/csharp/wsQuery/Program.cs
+++ b/docs/examples/csharp/wsQuery/Program.cs
@@ -7,13 +7,14 @@ namespace Examples
 {
     public class WSQueryExample
     {
-        static void Main(string[] args)
+        static int Main(string[] args)
         {
             string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
             IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
             if (wsConn == IntPtr.Zero)
             {
-                throw new Exception("get WS connection failed");
+                Console.WriteLine("get WS connection failed");
+                return -1;
             }
             else
             {
@@ -28,7 +29,9 @@ namespace Examples
             int code = LibTaosWS.WSErrorNo(wsRes);
             if (code != 0)
             {
-                throw new Exception($"execute SQL failed: reason: {LibTaosWS.WSErrorStr(wsRes)}, code:{code}");
+                Console.WriteLine($"execute SQL failed: reason: {LibTaosWS.WSErrorStr(wsRes)}, code:{code}");
+                LibTaosWS.WSFreeResult(wsRes);
+                return -1;
             }
 
             // get meta data
@@ -58,6 +61,8 @@ namespace Examples
 
             // close connection.
             LibTaosWS.WSClose(wsConn);
+
+            return 0;
         }
     }
 }
@@ -71,4 +76,4 @@ namespace Examples
 // 1538548685000   |       10.3    |       219     |       0.31    |       California.SanFrancisco |       2       |
 // 1538548695000   |       12.6    |       218     |       0.33    |       California.SanFrancisco |       2       |
 // 1538548696800   |       12.3    |       221     |       0.31    |       California.SanFrancisco |       2       |
-// 1538548696650   |       10.3    |       218     |       0.25    |       California.SanFrancisco |       3       |
\ No newline at end of file
+// 1538548696650   |       10.3    |       218     |       0.25    |       California.SanFrancisco |       3       |
diff --git a/docs/examples/csharp/wsStmt/Program.cs b/docs/examples/csharp/wsStmt/Program.cs
index 8af807ec39..f8673357db 100644
--- a/docs/examples/csharp/wsStmt/Program.cs
+++ b/docs/examples/csharp/wsStmt/Program.cs
@@ -7,7 +7,7 @@ namespace Examples
 {
     public class WSStmtExample
     {
-        static void Main(string[] args)
+        static int Main(string[] args)
         {
             const string DSN = "ws://root:taosdata@127.0.0.1:6041/test";
             const string table = "meters";
@@ -21,7 +21,8 @@ namespace Examples
             IntPtr wsConn = LibTaosWS.WSConnectWithDSN(DSN);
             if (wsConn == IntPtr.Zero)
             {
-                throw new Exception($"get WS connection failed");
+                Console.WriteLine($"get WS connection failed");
+                return -1;
             }
             else
             {
@@ -66,18 +67,20 @@ namespace Examples
             }
             else
             {
-                throw new Exception("Init STMT failed...");
+                Console.WriteLine("Init STMT failed...");
             }
 
             // close connection.
             LibTaosWS.WSClose(wsConn);
+
+            return 0;
         }
 
         static void ValidStmtStep(int code, IntPtr wsStmt, string desc)
         {
             if (code != 0)
             {
-                throw new Exception($"{desc} failed,reason: {LibTaosWS.WSErrorStr(wsStmt)}, code: {code}");
+                Console.WriteLine($"{desc} failed,reason: {LibTaosWS.WSErrorStr(wsStmt)}, code: {code}");
             }
             else
             {
@@ -92,4 +95,4 @@ namespace Examples
 // WSStmtBindParamBatch success...
 // WSStmtAddBatch success...
 // WSStmtExecute success...
-// WS STMT insert 5 rows...
\ No newline at end of file
+// WS STMT insert 5 rows...
diff --git a/tests/docs-examples-test/csharp.sh b/tests/docs-examples-test/csharp.sh
index 21c19b9b3d..c08ffd6d62 100644
--- a/tests/docs-examples-test/csharp.sh
+++ b/tests/docs-examples-test/csharp.sh
@@ -28,10 +28,10 @@ taos -s "drop database if exists test"
 dotnet run --project optsJSON/optsJSON.csproj
 
 taos -s "create database if not exists test"
-# dotnet run --project wsConnect/wsConnect.csproj
-# dotnet run --project wsInsert/wsInsert.csproj
-# dotnet run --project wsStmt/wsStmt.csproj
-# dotnet run --project wsQuery/wsQuery.csproj
+dotnet run --project wsConnect/wsConnect.csproj
+dotnet run --project wsInsert/wsInsert.csproj
+dotnet run --project wsStmt/wsStmt.csproj
+dotnet run --project wsQuery/wsQuery.csproj
 
 taos -s "drop database if exists test"
-taos -s "drop database if exists power"
\ No newline at end of file
+taos -s "drop database if exists power"