Home/ Questions/Q 621093
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-13T18:50:11+00:00

I want to build a custom validator control that inherits from BaseValidator. It will

  • 0

I want to build a custom validator control that inherits from BaseValidator. It will only be used on textboxes in my asp.net application. How can I get access to the textbox itself (read properties of the textbox) within the custom validator?

Here is what I have in my EvaluateIsValid function:

 Dim t As TextBox = CType(Page.FindControl(Me.ControlToValidate), TextBox)
 Return t.Text.Length <= t.MaxLength

It can’t seem to find the control, so it breaks with a null reference exception. Can I do this another way?

Thanks!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    To get the textbox:

    Dim t As TextBox = CType(Me.FindControl(Me.ControlToValidate), TextBox)

    • 0