private void button13_Click(object sender, EventArgs e)
{
int accountID = int.Parse(textBox1.Text.ToString());
Console.WriteLine(accountID);
if (DAO.check_accountID(acwithdraw.Username, accountID) == 0)
{
MessageBox.Show("不存在该账户！");
}
else
{
Transfer tfr1 = new Transfer(acwithdraw.Username.ToString(), acwithdraw.Accid, accountID, _mainform2);
tfr1.Show();
this.Hide();
}
}