Solution to failed to create designer when using the telerik Control
Choose one of the following three methods. (I used the third method. The first two are not tested)
- Bin-Deploy the design-time assembly
This solution wocould work only in case you have not installed radcontrols for ASP. net Ajax using the provided setup program. assemblies installed by a setup program cannot be removed from GAC until the program is uninstalled. this approach is suitable when using only the DLL-s from a ZIP (be that a hotfix or latest internal build ).
- Remove telerik. Web. Design. dll from the GAC (this wowould fail if you have installed radcotnrols for ASP. NET Ajax via the installer)
- Copy telerik. Web. Design. DLL to your web site or application and make sure the DLL is copied to the bin folder
- Restart Visual Studio
- GAC-Deploy the control library assembly
- Add telerik. Web. UI. dll in the GAC
- Remove telerik. Web. UI. dll from your bin folder
- Make sure you have the following line in your web. config:
<Add Assembly = "telerik. Web. UI, version = 2009.1.311.35, culture = neutral, publickeytoken = 121fae78165ba3d4"/>
- Restart Visual Studio
- Copy telerik. Web. UI. DLL to c: \ Program Files \ Microsoft Visual Studio 9.0 \ common7 \ ide \ publicassemblies and restart Visual Studio.
Source: http://blogs.telerik.com/atanaskorchev/posts/09-03-06/meet_telerik_web_design_dll.aspx