//Trigger event when selecting a drop-down box
private void cboBookTypeOne_SelectedValueChanged(object sender, EventArgs e)
{
//Determine if the options in the correct selection
if (cboBookTypeOne.SelectedValue == null)
{
return;
}
else if (!ValidateInput.IsInteger(cboBookTypeOne.SelectedValue.ToString()))
{
return;
}
else
{
//Determine if there are no level two options, if any, enable, load data in the database, no, remain disabled
if (objBookTypeServices.IsExistSubType(Convert.ToInt32(cboBookTypeOne.SelectedValue.ToString())))
{
//Enable subclass drop-down box
cboBookTypeTwo.Enabled = true;
//Load
LoadSubTypeInfo(Convert.ToInt32(cboBookTypeOne.SelectedValue.ToString()));
}
else
{
//Disable Subclass drop-down box
cboBookTypeTwo.Enabled = false;
cboBookTypeTwo.Text = "No secondary class";
}
//Generate numbers
lblBookId.Text = objBookServices.BuildNewBookId(Convert.ToInt32(cboBookTypeOne.SelectedValue.ToString()));
}
}
