On the testing server, delete the Virtual Directory “crystalreportviewers12″. This can be found under:

~\aspnet_client\system_web\2_0_50727\

Then, copy the “crystalreportviewers12″ folder from your install directory (something like “C:\Program Files\Business Objects\Common\4.0″) to that directory.

(Before doing this, make sure you install all patches for CR2008).

Let me know if that helps.

I tried so much but unable to find its solution do any one have face such an issue

Check this out:

http://weblogs.asp.net/scottgu/archive/2006/11/26/tip-trick-how-to-register-user-controls-and-custom-controls-in-web-config.aspx

This site suggests you should be able to insert

<add tagPrefix="prefix" src="~/path/to/Control.ascx" tagName="TagName"/>

To your web.config controls node. More search results; http://www.google.ca/search?hl=en&q=how%20to%20globally%20reference%20asp.net%20custom%20controls&meta=

http://msdn.microsoft.com/en-us/library/cc294876.aspx
http://msdn.microsoft.com/en-us/library/cc295210.aspx
http://msdn.microsoft.com/en-us/library/c76dd5k1.aspx

Let me know if you come up with more information, as I’d be interested in the solution. It would be great to have custom controls referenced in one placed and used throughout the application, without having to copy an assembly.

Have you been able to find a way to centralize all of the user control references in the web.config so that they don’t have to be repeated in each aspx file that loads and adds the controls programmatically?

I don’t know if that will work because the ASP namespace only contained Referenced classes in the examples I dealt with, but I wasn’t working with custom controls at all.

Your last resort would be to create an interface for each UserControl you want to use, specifying all the public properties/methods you want to call. Then have the UserControl reference that in an @Implements directive (if I remember correctly). You can then load that UserControl and reference it as that interface. Make sure you’re using the LoadControl(string) method to initialize dynamic controls, and NOT calling the constructor.

Let me know if you need more help or examples.

this is interesting post that you have made. I have similiar but little different problem with referencing user control and I’d like to ask you if you have encountered it and solved it. I have some user control and I’d like to use it in custom control. Custom control is just C# code – no markup, so I can’t use Reference tag as you did in your post. Is there any possibility to use user control in custom control? I am searching the web for the solution for quite a while now but without success. Thank you for reply in advance.