There is a radiobuttonlist which has two options and a textbox control.
If I select one option from the radio button, the textbox control should not be empty.
But these two controls are in the ItemTemplate of DataGrid.
If I use the txtname in servervalidateEventargs, it gives the error 'Field not defined'.
If I use 'e.item.findcontrol("txtname")', it gives the errot 'Item is not in the servervalidateEventargs'

public sub checkEmpty(s as object,args as servervalidateEventargs)
    dim txtname as TextBox
    txtname=e.Item.findcontrol("TxtName1)
    If args.value=2 and txtname.text="" then
        args.isValid=false
        exit sub
    else
        args.isvalid=True
    end if
end sub

Please reply me.

Thanks.

Hi,

I assume that your webform has a datagrid wherein each row has a radiobuttonlist with two options and a textbox. and there is submit button. When this button is clicked, the validation has to be performed.

When u hit the submit button, if one of the options in the radiobutton list is selected, the textbox shud not be empty.

U dont even have to use a custom validator. Because a custom validator only validates a particular control. In the validation function, if u only want to check a particular button is selected, u can do that if the controltovalidate of the validator is set to the radiobuttonlist. But in this function you cant get the textbox value because there is no reference to that particular item in the datagrid.

U can do the validation as follows on the submit button click (or whatever event in ur code)

  Dim dgi As DataGridItem
        For Each dgi In DataGrid1.Items
            If CType(dgi.FindControl("RadioButtonList1"), RadioButtonList).SelectedItem.Value = "1" And CType(dgi.FindControl("TextBox1"), TextBox).Text = String.Empty Then
                ErrorMessageLabel.text = "The textbox cannot be empty if Option 1 is selected"
                Exit Sub
            Else
                ErrorMessageLabel.text = String.Empty
                'Do the remaining tasks
            End If
        Next

Thanks
Pradeepa