ASP.net Redirect to the calling page

I have a page that calls another page with some query string parameters. I want to return back to that page after clicking on a but开发者_JAVA百科ton.

I have to mention that I write that code in a user control and I don't know what page called that second page.

Is there something like Back button in browsers?

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Simplest way use javascript on client side with

window.back();

For server side you need to save the url referer in page_load:

if(!Page.IsPostback)
{
  ViewState["GoBackTo"] = Request.UrlReferrer;
}

and on a button click using Response.Redirect:

Response.Redirect( ViewState["GoBackTo"].ToString() );

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edit: please note ppumkin's comment below!

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You could look at Cross Page Posting.

Alternatively, if you are generating the link programatically you could include the returnUrl in the url e.g. http://localhost/secondpage.aspx?returnurl=firstpage.aspx

You can then read this querystring parameter in the secondpage and perform as redirect back once your work is done.

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You can use the Request.UrlReferrer, but it is not necessarily sent from the client all the time:

        Response.Redirect(Request.UrlReferrer.AbsoluteUri);

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put this line of code on the page load event

 Btn_Back.Attributes.Add("onClick", "javascript:history.back(); return false;");