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postback fires error msg from other sub procedure

Hi, I have a page where a user can search for a name/address from an id_number entered in a txtbox, the user can also search for a user id_number from inputting user name and adress into different txtbox.

When I tried validating these controls using required field validators I struck a problem.
if the user enters data into one txtbox and hits the submit key for that search the error msg for the other
search function fires.

I realise why this happens. But how can I get around it?

Using asp.net 2.0
1 Solution
one method is validating your data client side by javascript and also use code in each button for serverside and not use regular validation, because these validations is just good when you have one button in your page and you won't postback your page twice.
 i would suggest you to use the validations in code behind. more over your search page would rquire to give a general search result if no specification was provided by the user.
 when user selects or provides some search conditions then you can filter your general search query and give filtered result.
You can simply do server side validation as suggested above.
If you want to use client side validation you need to remove your current validators for those text boxes, place one CustomValidator instead and write a small client script which perfoms necessary validation.
In that CustomValidator you will need to set the name of validation function in ClientValidationFunction property. See an example of such function below:
<script type="text/javascript">
function ClientValidation(source, arguments) {
    var TextBox1 = document.getElementById("TextBox1");
    var TextBox2 = document.getElementById("TextBox2");
    s1 = TextBox1.value; s2 = TextBox2.value;
    if (s1 == "" && s2 == "")
        arguments.IsValid = false;
        arguments.IsValid = true;    

This script section you can place at the botton of your .aspx file (after closing </html> tag).

By the way if your page is designed to perform some search in a database I can suggest you a special tool for this task: EasyQuery.NET WebForms. See http://devtools.korzh.com/eq/dotnet/ 
This page contains a link to special sample page which demonstrates how EasyQuery.NET controls work.
This tool is free for ASP.NET if you agree to leave special watermark  ("Easy Query') on control's background and "powered by..." link on EasyQuery.NET web page.
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