How do I use a query string in virtua lpath

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I have the following code on my site:

C#

<a href='<%# VirtualPathUtility.ToAbsolute("~/Products.aspx?category="+Eval("category")) %>'> <img src='<%# "/Store/Images/Thumbs/"+ Eval("CategoryImage") %>' /></a>

This displays imags for various categories in a database. When a user clicks on the image, i expect a redirect to products page which displays products for the selected category.

It works fine on localhost on visual studio but when i uplaod it to server, I get the error that '~/Products.aspx?category=selectedcategory' is not a valid virtual path.

I have tried using '/Products.aspx' and 'Products.aspx' in place of '~/Products.aspx' but i get the same error.

Posted 5-Aug-14 6:28am

Member 10235977

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Richard Deeming · Accepted Answer · 2014-08-05T09:21:00

Solution 1

Try moving the query-string outside of the ToAbsolute call:

C#

VirtualPathUtility.ToAbsolute("~/Products.aspx") + Eval("category", "?category={0}")

The reason this code works on your local machine but not on the server is most likely that it's configured as a .NET 4.0 application locally, but a .NET 2.0 / 3.5 application on the server. As mentioned in the Community Comments on the version-specific MSDN page[^], the .NET 2.0 version of this method incorrectly treated ? as an invalid character.

Posted 5-Aug-14 9:21am

Richard Deeming

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Member 10235977 6-Aug-14 6:11am

Thanks but it did not work for me. I still get the same error: '~/Products.aspx?category=selectedcategory' is not a valid virtual path.

Richard Deeming 6-Aug-14 7:23am

With what code? If you're getting that error from the VirtualPathUtility.ToAbsolute method, then you're not using the code I suggested; you're still passing the query-string into that method.

Member 10235977 7-Aug-14 5:54am

Yes you are right. It works. Many thanks.