private void textBox_PRD_ID_Validated(object sender, EventArgs e)
{
if (state == "Add")
{
if (!prod.Find_ID(textBox_PRD_ID.Text))
{
MessageBox.Show("Poduct ID is already exist", "Info", MessageBoxButtons.OK, MessageBoxIcon.Warning);
textBox_PRD_ID.Focus();
textBox_PRD_ID.SelectionStart = 0;
textBox_PRD_ID.SelectionLength = textBox_PRD_ID.TextLength;
}
}
}
