Use of PostBackUrl in ASP.NET 2.0
In this article you can understand how the aspx page is PostBack to another aspx Page. ASP.NET 2.0 inludes the button's property to perform this task very simple.
The text of this article is not in this database — only its details are. The old site it was published on is gone, but the Internet Archive kept a copy: Use of PostBackUrl in ASP.NET 2.0
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It is the same account you read, post and publish with — and you will come straight back to this page.

Vic TabramPosted Mar 14, 2011, 7:20 AM
Sorry but, you're using PreviousPage on the source page (source page IS the previous page), using an onclick that won’t be reached (a side effect of posting to another page), redirecting to an external site (thus losing any info from ‘PreviousPage’) and setting TxtName.Text to FindControl("txtName") when the latter isn't even defined anywhere!