コード例 #1
0
 private void tb_UserName_KeyDown(object sender, KeyEventArgs e)
 {
     if (e.KeyValue == 13)
     {
         if (!x.UserExist(tb_UserName.Text))
         {
             tb_Password.Focus();
         }
         else
         {
             MessageBox.Show("The User Name: " + tb_UserName.Text + " already Exist.");
         }
     }
 }