public FrmChangePass()
{
InitializeComponent();
BL.cls_login log = new BL.cls_login();
DataTable dt = log.Login("admin", "hahah");
txtID.Text = dt.Rows[0][0].ToString();
txtUserName.Text = dt.Rows[0][1].ToString();
txtOldPassword.Text = dt.Rows[0][2].ToString();
}