CODEWITHSUNDEEP
asp.net
user993935
user993935

Reputation: 3883

how to get the parent page reference

I have pages "first.aspx" and "second.aspx". Now from first.aspx, using link button I'm doing " Response.Redirect()" to "Third.aspx" and simlarly from second.aspx also with link button I'm doing " Response.Redirect() to "Third.aspx". but I want to disable a button on "third.aspx" when I come from " first.aspx" only . how can i acheive this.

Upvotes: 1

Views: 750

Answers (6)

Joel Etherton
Joel Etherton

Reputation: 37543

I like @Justin Niessner's response, but an alternative method would be instead of using a Response.Redirect to use the PostBackUrl property of the button in question. This would cause the page to "post" to the third.aspx page, and from there you would have access to `Page.PreviousPage'. More information on Previous page can be found on MSDN.

http://msdn.microsoft.com/en-us/library/system.web.ui.page.previouspage.aspx

Edit:
A bonus to using the PostBackUrl property is that it will invoke the standard .Net validation controls and will help prevent the spoofing mentioned by @Jan. It doesn't make it impossible, but it certainly makes it more difficult.

Upvotes: 0

Niklas Wulff
Niklas Wulff

Reputation: 3524

Add a query parameter to indicate which page you came from:

Response.Redirect('third.aspx?referrer=first');

and 

Response.Redirect('third.aspx?referrer=second');

in third:

if (Request["referrer"] == "first"){
    button.Enabled = false;
}

Upvotes: 0

TheGeekYouNeed
TheGeekYouNeed

Reputation: 7539

On Third.aspx, check the UrlReferrer

Upvotes: 0

Eugen Rieck
Eugen Rieck

Reputation: 65294

When coming from first.aspx redirect to Third.aspx?from=first, when coming from second.aspx redirect to Third.aspx?from=second, then use the get parameter to disable/enable your button

Upvotes: 0

Jan
Jan

Reputation: 16038

You can check the referrer of the request, but that might get spoofed:

Request.UrlReferrer

Or you can pass an url parameter.

Or if you don't want to rely on client side parameter passing, you can save the last page in the users session on the server and check that in your third.aspx page.

Upvotes: 1

Justin Niessner
Justin Niessner

Reputation: 245439

You could try using:

var enabled = Page.Request.UrlReferrer.ToString().Contains("first.aspx");

Upvotes: 1

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