Go back to previous page without Loosing Data ASP.NET

We can use client-side script (JS) for this purpose...

<input type="button" value="Click here to go back" onclick="javascript: return history.back();" /> 

or

<input type="button" value="Click here to go back" onclick="javascript: return history.go(-1);" />

or

javascript: return history.go(-1);

or

http://www.aspdotnetfaq.com/Faq/How-to-make-Cross-Page-Postback-in-ASP-Net.aspx