asp.net validation: how to compare values of 2 controls on the form and using some functions like substring,
<p>Hi
I have to compare 2 values which are the text property of 2 textbox controls on my .aspx form.</p>

<p>Using Compare validator does not enough for, I have to use some functions like substring.</p>

<p>As far as I know, the Compare validator does not allow to use substring. </p>

<p>Using Custom validator and handle it's serer-side "ServerValidate" event, as you know, It gives 2 arguments (source and args), how can I compare a text property of other control in this function? </p>

<p>If I can not, what is your solution?</p>
