diff --git a/src/connector/C#/src/test/FunctionTest/FetchFields.cs b/src/connector/C#/src/test/FunctionTest/FetchFields.cs
index 67f24fe1a671657f47e75ee3d6e35e1ce0d9402d..b0a5859d4dddef0b24bd98cc8183917b6ec4e1cb 100644
--- a/src/connector/C#/src/test/FunctionTest/FetchFields.cs
+++ b/src/connector/C#/src/test/FunctionTest/FetchFields.cs
@@ -4,19 +4,32 @@ using TDengineDriver;
 using System.Collections.Generic;
 using Xunit;
 using Test.UtilsTools.ResultSet;
+using Test.Fixture;
+using Test.Case.Attributes;
+
 namespace Cases
 {
-    public class FetchFieldsCases
+    [TestCaseOrderer("XUnit.Case.Orderers.TestExeOrderer", "Cases.ExeOrder")]
+    [Collection("Database collection")]
+    public class FetchFieldCases
     {
+
+         DatabaseFixture database;
+
+
+        public FetchFieldCases(DatabaseFixture fixture)
+        {
+            this.database = fixture;
+        }
         /// <author>xiaolei</author>
         /// <Name>FetchFieldsCases.TestFetchFieldsJsonTag</Name>
         /// <describe>test taos_fetch_fields(), check the meta data</describe>
         /// <filename>FetchFields.cs</filename>
         /// <result>pass or failed </result>  
-        [Fact(DisplayName = "FetchFieldsCases.TestFetchFieldsJsonTag()")]
-        public void TestFetchFieldsJsonTag()
+        [Fact(DisplayName = "FetchFieldsCases.TestFetchFieldJsonTag()"),TestExeOrder(1),Trait("Category", "FetchFieldJsonTag")]
+        public void TestFetchFieldJsonTag()
         {
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             IntPtr _res = IntPtr.Zero;
             string tableName = "fetch_fields";
             var expectResMeta = new List<TDengineMeta> {
diff --git a/src/connector/C#/src/test/FunctionTest/FetchLength.cs b/src/connector/C#/src/test/FunctionTest/FetchLength.cs
index 130b53bfc898231456c3f4d0c068108ffa7f50bd..928e1dfa92a723c52a2939bece2552ddeba7fd3f 100644
--- a/src/connector/C#/src/test/FunctionTest/FetchLength.cs
+++ b/src/connector/C#/src/test/FunctionTest/FetchLength.cs
@@ -4,8 +4,11 @@ using System.Collections.Generic;
 using Xunit;
 using TDengineDriver;
 using Test.UtilsTools.ResultSet;
+using Test.Case.Attributes;
 namespace Cases
 {
+    [TestCaseOrderer("XUnit.Case.Orderers.TestExeOrderer", "Cases.ExeOrder")]
+
     public class FetchLengthCase
     {
         /// <author>xiaolei</author>
@@ -13,7 +16,7 @@ namespace Cases
         /// <describe>TD-12103 C# connector fetch_row with binary data retrieving error</describe>
         /// <filename>FetchLength.cs</filename>
         /// <result>pass or failed </result>
-        [Fact(DisplayName = "Skip FetchLengthCase.TestRetrieveBinary()")]
+        [Fact(DisplayName = "FetchLengthCase.TestRetrieveBinary()"),TestExeOrder(1)]
         public void TestRetrieveBinary()
         {
             IntPtr conn = UtilsTools.TDConnection();
diff --git a/src/connector/C#/src/test/FunctionTest/InsertCn.cs b/src/connector/C#/src/test/FunctionTest/InsertCn.cs
index 3406f1cad448df20c1fb04f2d734738eaa1dfbea..51931340f50a9b9b8876a1d8ba2cf11c13259e97 100644
--- a/src/connector/C#/src/test/FunctionTest/InsertCn.cs
+++ b/src/connector/C#/src/test/FunctionTest/InsertCn.cs
@@ -5,19 +5,28 @@ using Test.UtilsTools.DataSource;
 using Xunit;
 using System.Collections.Generic;
 using Test.UtilsTools.ResultSet;
+using Test.Case.Attributes;
+using Test.Fixture;
 namespace Cases
 {
+    [TestCaseOrderer("XUnit.Case.Orderers.TestExeOrderer", "Cases.ExeOrder")]
+    [Collection("Database collection")]
     public class InsertCNCases
     {
+        DatabaseFixture database;
+        public InsertCNCases(DatabaseFixture fixture)
+        {
+            this.database = fixture;
+        }
         /// <author>xiaolei</author>
         /// <Name>InsertCNCases.TestNTable</Name>
         /// <describe>Test insert Chinese characters into normal table's nchar column</describe>
         /// <filename>InsertCn.cs</filename>
         /// <result>pass or failed </result>  
-        [Fact(DisplayName = "InsertCNCases.TestNTable()")]
+        [Fact(DisplayName = "InsertCNCases.TestNTable"), TestExeOrder(1)]
         public void TestNTable()
         {
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             IntPtr _res = IntPtr.Zero;
             string tableName = "cn_insert_nchar_ntable";
             // var expectResData = new List<String> { "1637064040000", "true", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "XI", "XII", "{\"k1\": \"v1\"}" };
@@ -68,10 +77,10 @@ namespace Cases
         /// <describe>test insert Chinese character into stable's nchar column,both tag and column</describe>
         /// <filename>InsertCn.cs</filename>
         /// <result>pass or failed </result>  
-        [Fact(DisplayName = "InsertCNCases.TestSTable()")]
+        [Fact(DisplayName = "InsertCNCases.TestSTable()"), TestExeOrder(2)]
         public void TestSTable()
         {
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             IntPtr _res = IntPtr.Zero;
             string tableName = "cn_insert_nchar_stable";
             var colData = new List<Object>{1637064040000,1,"涛思数据",
@@ -122,10 +131,10 @@ namespace Cases
         /// <describe>test insert Chinese character into normal table's multiple nchar columns</describe>
         /// <filename>InsertCn.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "InsertCNCases.TestInsertMultiNTable()")]
+        [Fact(DisplayName = "InsertCNCases.TestInsertMultiNTable()"), TestExeOrder(3)]
         public void TestInsertMultiNTable()
         {
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             IntPtr _res = IntPtr.Zero;
             string tableName = "cn_multi_insert_nchar_ntable";
             var colData = new List<Object>{1637064040000,1,"涛思数据","保利广场","Beijing","China",
@@ -140,7 +149,7 @@ namespace Cases
             };
 
             String dropTb = "drop table if exists " + tableName;
-            String createTb = $"create table if not exists {tableName} (ts timestamp,v4 int,blob nchar(200),location nchar(200),city binary(100),country binary(200));";
+            String createTb = $"create table if not exists {tableName} (ts timestamp,v4 int,blob nchar(200),location nchar(200),city binary(100),coutry binary(200));";
             String insertSql = UtilsTools.ConstructInsertSql(tableName, "", colData, null, 9);
             String selectSql = "select * from " + tableName;
             String dropSql = "drop table " + tableName;
@@ -174,10 +183,10 @@ namespace Cases
         /// <describe>test insert Chinese character into stable's multiple nchar columns</describe>
         /// <filename>InsertCn.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "InsertCNCases.TestInsertMultiSTable()")]
+        [Fact(DisplayName = "InsertCNCases.TestInsertMultiSTable()"), TestExeOrder(4)]
         public void TestInsertMultiSTable()
         {
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             IntPtr _res = IntPtr.Zero;
             string tableName = "cn_multi_insert_nchar_stable";
             var colData = new List<Object>{1637064040000,1,"涛思数据","保利广场","Beijing","China",
@@ -233,4 +242,4 @@ namespace Cases
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/connector/C#/src/test/FunctionTest/StmtNormalTable.cs b/src/connector/C#/src/test/FunctionTest/StmtNormalTable.cs
index 418b6f9400d2a22d112e1ea005f30bfb829cb0da..72983dd02d44d8a1cf1cb2b80cf5ed033860b2f4 100644
--- a/src/connector/C#/src/test/FunctionTest/StmtNormalTable.cs
+++ b/src/connector/C#/src/test/FunctionTest/StmtNormalTable.cs
@@ -5,16 +5,27 @@ using Test.UtilsTools.DataSource;
 using Xunit;
 using System.Collections.Generic;
 using Test.UtilsTools.ResultSet;
+using Test.Fixture;
+using Test.Case.Attributes;
+
 namespace Cases
 {
+    [TestCaseOrderer("XUnit.Case.Orderers.TestExeOrderer", "Cases.ExeOrder")]
+    [Collection("Database collection")]
     public class NormalTableStmtCases
     {
+        DatabaseFixture database;
+
+        public NormalTableStmtCases(DatabaseFixture fixture)
+        {
+            this.database = fixture;
+        }
         /// <author>xiaolei</author>
         /// <Name>NormalTableStmtCases.TestBindSingleLineCN</Name>
         /// <describe>Test stmt insert single line of chinese character into normal table by column after column </describe>
         /// <filename>StmtNormalTable.cs</filename>
         /// <result>pass or failed </result>  
-        [Fact(DisplayName = "NormalTableStmtCases.TestBindSingleLineCN()")]
+        [Fact(DisplayName = "NormalTableStmtCases.TestBindSingleLineCN()"),TestExeOrder(2),Trait("Category", "bindParamCN")]
         public void TestBindSingleLineCN()
         {
             string tableName = "ntb_stmt_cases_test_bind_single_line_cn";
@@ -42,7 +53,7 @@ namespace Cases
             List<string> expectResData = DataSource.GetNTableCNRowData();
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createTb);
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createTb);
 
@@ -80,7 +91,7 @@ namespace Cases
         /// <describe>Test stmt insert single line of chinese character into normal table by column after column </describe>
         /// <filename>StmtNormalTable.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "NormalTableStmtCases.TestBindColumnCN()")]
+        [Fact(DisplayName = "NormalTableStmtCases.TestBindColumnCN()"),TestExeOrder(4),Trait("Category", "bindSingleColumnCN")]
         public void TestBindColumnCN()
         {
             string tableName = "ntb_stmt_cases_test_bind_column_cn";
@@ -107,7 +118,7 @@ namespace Cases
             TAOS_MULTI_BIND[] mBind = DataSource.GetMultiBindCNArr();
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createTb);
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createTb);
 
@@ -162,7 +173,7 @@ namespace Cases
         /// <describe>Test stmt insert single line of chinese character into normal table by column after column </describe>
         /// <filename>StmtNormalTable.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "NormalTableStmtCases.TestBindMultiLineCN()")]
+        [Fact(DisplayName = "NormalTableStmtCases.TestBindMultiLineCN()"),TestExeOrder(6),Trait("Category", "bindParamBatchCN")]
         public void TestBindMultiLineCN()
         {
             string tableName = "ntb_stmt_cases_test_bind_multi_lines_cn";
@@ -189,7 +200,7 @@ namespace Cases
             List<string> expectResData = DataSource.GetMultiBindCNRowData();
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createTb);
 
-            IntPtr conn = UtilsTools.TDConnection(); ;
+            IntPtr conn = database.conn; ;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createTb);
 
@@ -231,7 +242,7 @@ namespace Cases
         /// <describe>Test stmt insert single line data into normal table</describe>
         /// <filename>StmtNormalTable.cs</filename>
         /// <result>pass or failed </result>
-        [Fact(DisplayName = "NormalTableStmtCases.TestBindSingleLine")]
+        [Fact(DisplayName = "NormalTableStmtCases.TestBindSingleLine"),TestExeOrder(3),Trait("Category", "BindSingleColumn")]
         public void TestBindSingleLine()
         {
             string tableName = "ntb_stmt_cases_test_bind_single_line";
@@ -259,7 +270,7 @@ namespace Cases
             List<string> expectResData = DataSource.GetNTableRowData();
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createTb);
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteQuery(conn, dropSql);
             UtilsTools.ExecuteQuery(conn, createTb);
 
@@ -296,14 +307,14 @@ namespace Cases
         }
 
         /// <author>xiaolei</author>
-        /// <Name>NTableMultipleLine.TestBindMultiLine</Name>
+        /// <Name>NormalTableStmtCases.TestBindMultiLine</Name>
         /// <describe>Test stmt insert multiple rows of data into normal table</describe>
         /// <filename>StmtNormalTable.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "NormalTableStmtCases.TestBindMultiLine()")]
+        [Fact(DisplayName = "NormalTableStmtCases.TestBindMultiLine()"),TestExeOrder(5),Trait("Category", "bindParamBatch")]
         public void TestBindMultiLine()
         {
-            string tableName = "normal_table_stmt_cases_test_bind_multi_lines";
+            string tableName = "ntb_stmt_case_test_bind_multi_lines";
             String createTb = $"create table if not exists {tableName} " +
                                 " (" +
                                 "ts timestamp," +
@@ -327,7 +338,7 @@ namespace Cases
             TAOS_MULTI_BIND[] mBind = DataSource.GetMultiBindArr();
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createTb);
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createTb);
 
@@ -365,14 +376,14 @@ namespace Cases
         }
 
         /// <author>xiaolei</author>
-        /// <Name>NormalTableStmtCases.TestBindColumnCn</Name>
+        /// <Name>NormalTableStmtCases.TestBindColumn</Name>
         /// <describe>Test stmt insert multiple rows of data into normal table by column after column </describe>
         /// <filename>StmtNormalTable.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "NormalTableStmtCases.TestBindColumn()")]
+        [Fact(DisplayName = "NormalTableStmtCases.TestBindColumn()"),TestExeOrder(1),Trait("Category", "bindParam")]
         public void TestBindColumn()
         {
-            string tableName = "ntb_stmt_cases_test_bind_column_cn";
+            string tableName = "ntb_stmt_cases_test_bind_column";
             DataSource data = new DataSource();
             String createTb = $"create table if not exists {tableName} " +
                                 " (" +
@@ -398,7 +409,7 @@ namespace Cases
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createTb);
 
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createTb);
 
diff --git a/src/connector/C#/src/test/FunctionTest/StmtStable.cs b/src/connector/C#/src/test/FunctionTest/StmtStable.cs
index d2cf931e945519853497eb55bb03e028656b3a13..44ecb298ffcfb3786c1fe76e4ce65336ad2b52fd 100644
--- a/src/connector/C#/src/test/FunctionTest/StmtStable.cs
+++ b/src/connector/C#/src/test/FunctionTest/StmtStable.cs
@@ -5,17 +5,30 @@ using Test.UtilsTools.DataSource;
 using System.Collections.Generic;
 using Test.UtilsTools.ResultSet;
 using Xunit;
+using Test.Fixture;
+using Test.Case.Attributes;
 
 namespace Cases
 {
+    [TestCaseOrderer("XUnit.Case.Orderers.TestExeOrderer", "Cases.ExeOrder")]
+    [Collection("Database collection")]
+
     public class StableStmtCases
     {
+
+        DatabaseFixture database;
+
+
+        public StableStmtCases(DatabaseFixture fixture)
+        {
+            this.database = fixture;
+        }
         /// <author>xiaolei</author>
         /// <Name>StableStmtCases.TestBindSingleLineCN</Name>
         /// <describe>Test stmt insert single line of chinese character into stable by column after column </describe>
         /// <filename>StmtSTable.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "StableStmtCases.TestBindSingleLineCN()")]
+        [Fact(DisplayName = "StableStmtCases.TestBindSingleLineCN()"),TestExeOrder(2),Trait("Category", "BindParamCN")]
         public void TestBindSingleLineCN()
         {
             string tableName = "stb_stmt_cases_test_bind_single_line_cn";
@@ -57,7 +70,7 @@ namespace Cases
             TAOS_BIND[] tags = DataSource.GetCNTags();
             TAOS_BIND[] binds = DataSource.GetNTableCNRow();
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createSql);
 
@@ -99,7 +112,7 @@ namespace Cases
         /// <describe>Test stmt insert single line of chinese character into stable by column after column </describe>
         /// <filename>StmtSTable.cs</filename>
         /// <result>pass or failed </result>
-        [Fact(DisplayName = "StableStmtCases.TestBindColumnCN()")]
+        [Fact(DisplayName = "StableStmtCases.TestBindColumnCN()"),TestExeOrder(4),Trait("Category", "BindParamColumnCN")]
         public void TestBindColumnCN()
         {
             string tableName = "stb_stmt_cases_test_bindcolumn_cn";
@@ -141,7 +154,7 @@ namespace Cases
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createSql);
             List<String> expectResData = DataSource.GetMultiBindStableCNRowData();
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createSql);
 
@@ -199,7 +212,7 @@ namespace Cases
         /// <describe>Test stmt insert single line of chinese character into stable by column after column </describe>
         /// <filename>StmtSTable.cs</filename>
         /// <result>pass or failed </result>
-        [Fact(DisplayName = "StableStmtCases.TestBindMultiLineCN()")]
+        [Fact(DisplayName = "StableStmtCases.TestBindMultiLineCN()"),TestExeOrder(6),Trait("Category", "BindParamBatchCN")]
         public void TestBindMultiLineCN()
         {
             string tableName = "stb_stmt_cases_test_bind_multi_line_cn";
@@ -241,7 +254,7 @@ namespace Cases
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createSql);
             List<String> expectResData = DataSource.GetMultiBindStableCNRowData();
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createSql);
 
@@ -282,11 +295,11 @@ namespace Cases
         /// <describe>Test stmt insert single line into stable by column after column </describe>
         /// <filename>StmtSTable.cs</filename>
         /// <result>pass or failed </result>         
-        [Fact(DisplayName = "StableStmtCases.TestBindMultiLine()")]
+        [Fact(DisplayName = "StableStmtCases.TestBindMultiLine()"),TestExeOrder(5),Trait("Category", "BindParamBatch")]
         public void TestBindMultiLine()
         {
             string tableName = "stb_stmt_cases_test_bind_multi_line";
-            string createSql = $"create stable  if not exists {tableName} " +
+            string createSql = $"create stable if not exists {tableName} " +
                                 "(ts timestamp," +
                                 "b bool," +
                                 "v1 tinyint," +
@@ -324,7 +337,7 @@ namespace Cases
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createSql);
             List<String> expectResData = DataSource.GetMultiBindStableRowData();
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createSql);
 
@@ -370,7 +383,7 @@ namespace Cases
         /// <describe>Test stmt insert single line of chinese character into stable by column after column </describe>
         /// <filename>StmtSTable.cs</filename>
         /// <result>pass or failed </result> 
-        [Fact(DisplayName = "StableStmtCases.TestBindColumn()")]
+        [Fact(DisplayName = "StableStmtCases.TestBindColumn()"),TestExeOrder(3),Trait("Category", "BindParamColumn")]
         public void TestBindColumn()
         {
             string tableName = "stb_stmt_cases_test_bindcolumn";
@@ -412,7 +425,7 @@ namespace Cases
             List<TDengineMeta> expectResMeta = DataSource.GetMetaFromDDL(createSql);
             List<String> expectResData = DataSource.GetMultiBindStableRowData();
 
-            IntPtr conn = UtilsTools.TDConnection();
+            IntPtr conn = database.conn;
             UtilsTools.ExecuteUpdate(conn, dropSql);
             UtilsTools.ExecuteUpdate(conn, createSql);