如何使用C＃使用相同的SQL Server连接运行foreach循环

Question

我在C＃程序中有一个字符串数组，我需要将其加载到SQL Server的临时表中。我目前正在使用foreach循环来运行插入查询。当SQL连接关闭时，临时表会消失，所以当数组中有数百个表时，我最终会得到一个只有1行的表。

我试过添加

using (SqlConnection sqlconnection2 = new SqlConnection())

方法顶部的语句（删除现有的连接线，在If(ConnSucceeds)语句内部，在try块内部，在foreach循环内部。当它在foreach循环内部时我有同样的问题。把它放在其他任何地方我得到一个错误说明连接未打开。

最后，我需要添加至少一个foreach循环来运行另一个SQL查询来操作数据，然后找到一些方法将它导出到文本文件全部使用相同的连接。

    private void ImportToTempTable()
    {
        this.GetProgramInfoForSQLQuery();
        this.GetInstallFolder();
        string config = this._InstallFolder + @"" + this._Version + @"" + this._brandName + @".exe.config";
        GetInstanceName(config);

        string connStr = "<proprietary conn string parameters>";
        bool ConnSucceeds = false;

        SqlConnection sqlConnection = new SqlConnection();
        StringBuilder errorMessages = new StringBuilder();

        if (!ConnSucceeds)
        {
            try
            {
                sqlConnection.ConnectionString = connStr;
                sqlConnection.Open();
                this.WriteNote("SQL Connection Succeeded");
                this.WriteNote("");
                ConnSucceeds = true;
            }
            catch (Exception ex)
            {
                ProjectData.SetProjectError(ex);
                int num = (int)Interaction.MsgBox((object)(@"Unable to connect to SQL Server:" + sqlConnection.ConnectionString + @"
                Does the " + this._brandName + " Database Live on this Machine?"), MsgBoxStyle.Exclamation, (object)"SQL Connection Error");
                ProjectData.ClearProjectError();
            }
        }

        if (ConnSucceeds)
        {
            string filename = @"C:Program FolderDC_Importsdc_raw.txt";

            try
            {
                StreamReader s = new StreamReader(filename);
                string fileContents = s.ReadToEnd();
                int removeHeader = fileContents.IndexOf('
');
                string contentsNoHeader = fileContents.Substring(removeHeader);
                string contentsFixed = contentsNoHeader.Replace("'", "''");
                string delim = "
";
                string[] Rows = contentsFixed.Split(delim.ToCharArray());

                foreach (string row in Rows)
                {
                    string query = @"USE DBName IF (NOT EXISTS (SELECT * FROM tempdb.sys.tables WHERE name LIKE '%#DCImportTable%'))
BEGIN
CREATE TABLE #DCImportTable (Main varchar (8000));
INSERT INTO #DCImportTable (Main) VALUES ('" + row + @"');
END
ELSE 
INSERT INTO #DCImportTable (Main) VALUES ('" + row + "');";

                        SqlCommand command = new SqlCommand(query, sqlConnection);
                        command.ExecuteNonQuery();
                        this.WriteNote(row);                  
                }

                this.WriteNote("Check Table");
                this.WriteNote("");
            }
            catch (SqlException ex)
            {
                for (int i = 0; i < ex.Errors.Count; i++)
                {
                    errorMessages.Append("Error 
" +
                        "Message: " + ex.Errors[i].Message + "
");
                }

                this.WriteNote(errorMessages.ToString());
                sqlConnection.Close();
                this.WriteNote("SQL Connection Terminated");
            }
        }
        else
        {
            this.WriteNote("SQL Login Incorrect");
            sqlConnection.Close();
            this.WriteNote("SQL Connection Terminated");
        }
}

任何帮助将不胜感激！这可能是我曾尝试编码的最复杂的事情，我必须使用临时表来完成它。