Common Issues with Rad Grid : Input string was not in a correct format.

If you get this error "Error: Sys.WebForms.PageRequestManagerServerErrorException: Input string was not in a correct format." when u click on the edit button of your radgrid data item, what you have to do is first check whether the data-format-strings are correct in your grid. I got this error because I have incorrectly configured the data-format-string for the given object's fields.

Hope this helps, thanks :-)