C# (CSharp) ITPLibrary BookRegValidation.isLetter示例

示例#1

        private void QtyTxt_TextChanged(object sender, EventArgs e)
        {
            string qty = QtyTxt.Text;

            if (BookRegValidation.isLetter(qty))
            {
                errorProvider1.SetError(QtyTxt, "can contain only Numbers");
                btregbk.Enabled = false;
            }
            else
            {
                errorProvider1.Clear();
                btregbk.Enabled = true;
            }
        }