sql c#

C-#入门经典(第三版).pdf
using System;
using System.Data;
using System.Data.SqlClient;
namespace My_Student
{
    static class Program
    {
       
        static void Main()
        {
            //连接字符串，连接本地的MS SQL Server服务器
            string connString = "data source=MICROSOF-84BB45;persist security info=False;initial catalog=MyDB;integrated security=SSPI;";
            //SQL语句，删除记录
            string sqlString = "delete from Courses where CourseNo='001'";
            //建立连接对象
            SqlConnection conn = new SqlConnection(connString);
            conn.Open();//打开连接
            //建立数据命令对象
            SqlCommand cmd = new SqlCommand(sqlString, conn);
            //执行命令，返回影响的行数
            int rowsReturned = cmd.ExecuteNonQuery();
            Console.WriteLine("{0} 记录已删除", rowsReturned);
            MessageBox.Show("数据库更新成功！！");
            conn.Close();//关闭连接
        }
    }
}
try
       &nb