Question

I am new to the Entity Data framework and lambda query.

What I am trying to do is select a list of “contacts” and bind it to a grid or repeater.

However, although my query works in that it is able to retrieve contact records, I am unable to bind it to a repeater. When I do, it says “Object reference not set to an instance of an object”.

Can someone please tell me what I am doing wrong?

IQueryable<Contact> contactsQuery = from c in cc.Contacts
from g in c.ContactGroups
where g.GroupNameID == 1
select c;

MyRepeater.DataSource = contactsQuery;
MyRepeater.DataBind();

The problem code is thrown and on the Datasource specification line:

MyRepeater.DataSource = contactsQuery;

Answer 1

This exception is thrown from somewhere inside your Contact class. Try looking at the property mappings and nullable properties, the problem is most likely there.