Luis,

>I copied an example code from book and it was about contextual menu is very simple code , but i had this error message:
>Error trying to execute teh project.teh file or assmebly can not be loaded and neither one of its dependences.The assembly name or base code given is not valid.(Exception HRESULT: 0x80131047)
>
>How can i solve this problem??

In addition to what Bonnie asked, is the sample code your entering based on the same version of dot net you are using?

Tim