private void button1_Click(object sender, EventArgs e)
{
string xx = DataOperation.GetMD5(password.Text.Trim());
if (DataOperation.ExecQuery("select * from system where username='******' and password='******'").Rows.Count == 1)
{
this.DialogResult = DialogResult.OK; //返回一个登录成功的对话框状态
this.Close(); //关闭登录窗口
}
else
{
MessageBox.Show("账号密码错误！！");
}
}