I have an existing project that compiles and runs. I add a new radform and it compiles and runs. I add a radgrid to the new form and it compiles and runs. I try to edit anything about the new radgrid control and I get an error that reads, "object reference not set to an instance of an object."

 

This is very frustrating. I have removed the references and added them back. I rebuilt the application. Again, I can compile and just can't do anything with the grid control in design view.

Hello Chris,

Thank you for writing.

I am sorry to hear about this negative experience of yours. The information provided makes me think that there are assembly version mismatch in your project, so may I please ask you to check the versions of all Telerik assemblies referenced in your project and make sure they are precisely the same. 

Also, can you please share which version(s) of Telerik UI for WinForms you have installed on your machine?

I am looking forward to your reply.

Regards,
Stefan
Telerik