I would like to bind my dataset to CalenderInfo object which has Guid(as primary key column) apart from few other columns.

When i try to create an appointment by clicking on the mouse-hover button on each date cell i get an exception.

Exception being "NoNullAllowedException" with message being "Column 'GUID' does not allow nulls." 

Can any one please suggest me a way to create a new record and add into my datase