Question

I have an object that has a property:

[Column]
public Binary Image { get; set; }

When the object is saved the first time every this is OK, but when it is modified I get an exception on SubmitChanges:

The data types image and
varbinary(max) are incompatible in the
equal to operator.

What might be the problem here?

Answer 1

Are you getting the, “” exception? The problem is that linq2sql wants to check to make sure it should modify the column before it actually modifies it. I usually don’t care as much and am perfectly happy updating the entire row so I put the UpdateCheck = UpdateCheck.Never named parameter in my ColumnAttributes. I.e.,

[Column(UpdateCheck = UpdateCheck.Never)]

Then, when I want to save the item, I just do this:

Table<TEntity> da = MyDataContext.Context.GetTable<TEntity>();

if (entity.Id > 0)
    da.Attach(entity, true);

else
    da.InsertOnSubmit(entity);

da.Context.SubmitChanges();