public void ThemMavach()
{
DataTable _dt = new DataTable();
Dto_user = new DTO_User();
Dto_user.User = txtU.Text.Trim();
Dto_user.Pass = txtP.Text.Trim();
_dt = _db.DangNhap(ref err, Dto_user);
if (_dt.Rows.Count > 0)
{
if (_dt.Rows[0]["ErrCode"].ToString() == "0")
{
cls_Main._username = _dt.Rows[0]["ErrUser"].ToString();
this.Hide();
Form1 frmain = new Form1();
frmain.ShowDialog();
}
}
}