Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string connstr = "server=.\\sql2005;database=mytest; uid=sa;pwd=sa";
            using (SqlConnection conn = new SqlConnection(connstr))
            {
                SqlCommand cmd = new SqlCommand();
                string sqlstr = "select * from user_login where username='" + textBox1.Text + "'";
                cmd.Connection = conn;
                cmd.CommandText = sqlstr;
                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();
                if (dr.Read())
                {
                    if(textBox2 .Text ==(string)dr["password"])
                    {
                        MessageBox.Show("登录成功");

                      this.DialogResult  = DialogResult.OK;
                        //Form2 f2 = new Form2();
                        //this.Hide();
                        //f2.username =(string)dr["username"];
                        //f2.Show();
                       
                    
                    }
                    else
                    {
                        MessageBox.Show("密码错误");
                    
                    }

                }
                else
                {
                    MessageBox.Show("用户名错误");
                
                }
                    
            }

        }
    }