尝试:

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlCommand com = new SqlCommand("SELECT iD, description FROM myTable", con))
        {
        using (SqlDataReader reader = com.ExecuteReader())
            {
            while (reader.Read())
                {
                int id = (int) reader["iD"];
                string desc = (string) reader["description"];
                Console.WriteLine("ID: {0}\n    {1}", iD, desc);
                }
            }
        }
    }

通过使用服务器资源管理器"窗格在VS中建立连接，可以很容易地获得连接字符串:
1)打开服务器资源管理器.
2)右键单击数据连接"，然后选择添加连接"
3)在随后的对话框中，选择您的数据源和数据库，指定安全信息，然后按测试连接"按钮.
4)连接正常后，按确定"
5)在服务器资源管理器"窗格中突出显示您的数据库，然后查看属性"窗格.将显示一个连接字符串的工作示例，您可以将其复制并粘贴到您的应用程序或配置文件中.

You can get the connection string pretty easily by setting up a connection in VS with the Server Explorer pane:
1) Open Server Explorer.
2) Right click "Data connections" and select "Add connection"
3) In the dialog that follows, select your DataSource, and database, specify the security info, and press the "Test connection" button.
4) When the connection works, press "OK"
5) Highlight your database in the Server Explorer pane, and look at the Properties pane. A working example of the connection string will be shown, which you can copy and paste into your app or config file.