Question

am getting this error once i try to update a bit field with null. please note that technically the bit is set to ‘allow null’.

am getting this error :
‘Object of type ‘System.DBNull’ cannot be converted to type ‘System.Nullable`

When I do this :

 e.NewValues.Add("IdleBlock", DBNull.Value);

Answer 1

Try using an actual null instead of DBNull.Value. As you can see in the error message it’s trying to convert the latter into a null, so I’m guessing EF wants a proper null value and handle conversion on it’s own.

Edit: Err, actually I think I’m wrong here. It wants a System.Nullable not a null. Try passing it a new System.Nullable with Value set to null?