C#winform连接数据库

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Data.SqlClient;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace register

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void login_Click(object sender, EventArgs e)

{

string constr = "data source=Z0IFVEMLZUDERWD//数据源;initial catalog=testDB//数据库名;user id=myuser//用户名;pwd=a";

SqlConnection con = new SqlConnection(constr);//开始连接数据库

// con.ConnectionString = constr;

string sql = "select count(*) from student";

SqlCommand com = new SqlCommand(sql, con);//执行数据库语句

try

{

con.Open();

MessageBox.Show("成功连接数据库");

int x = (int)com.ExecuteScalar();

MessageBox.Show(string.Format("成功读取{0},条记录", x));

}

catch (Exception)

{

throw;

}

finally {

con.Close();

MessageBox.Show("成功关闭数据库连接", "提示信息", MessageBoxButtons.YesNoCancel);

}

}

}

}