I have a radgridview with 3 columns, one of which is a gridviewlookupcolumn.
The data is populated using LinqToSql classes as followingf

DataClasses2DataContext

dcl = new DataClasses2DataContext();

GridViewLookUpColumn gvc = new GridViewLookUpColumn("SuitabilityIndex1");

radGridView1.DataSource = dcl.USBDevices;

radGridView1.Columns[

"Id"].IsVisible = false;

radGridView1.Columns[

"SuitabilityIndex"].IsVisible = false;

radGridView1.Columns[

"Manufacturer"].StretchVertically = true;

System.Collections.Generic.

List<short> dd = new List<short>();

dd.Add(0);

dd.Add(1);

dd.Add(2);

gvc.DataSource = dd;

radGridView1.Columns.Add(gvc);

radGridView1.Columns[

"SuitabilityIndex1"].FieldName = "SuitabilityIndex";

The field SuitabilityIndex in the database is smallInt that allows null. The datasource for the lookup column is short

When I change the value in the lookup column, it fires the data error event with the following error

{Telerik.WinControls.UI.GridViewDataErrorEventArgs}

base {Telerik.WinControls.UI.GridViewCellCancelEventArgs}: {Telerik.WinControls.UI.GridViewDataErrorEventArgs}

Context: Commit

Exception: {"Object of type 'System.String' cannot be converted to type 'System.Nullable`1[System.Int16]'."}

ThrowException: false

I think the problem is that the lookupcolumn thinks that the datatype os string. I can say that for sure since the allignmnet of values on the grid are to the left and not to the right.
I tried setting the datatype of the column to short, but did not help

Thanks
Deepak