Thank you for writing.
Your question has already been answered in the support thread that you have opened on the same topic. However, I am posting the answer here as well so the community can benefit from it.
I confirm that it is a known issue when filtering the RadGridView
exists with DBNull.Value
is the feedback item for your reference. As you have already found out, the fix is introduced in Q3 2014 SP1
Currently, due to the specificity of the issue, the possible solution that we can suggest for the specific version is to initialize default value (true
) for the cells belonging to GridViewCheckBoxColumn
if it is DBNull. Another approach is to create a DataTable filled with the specific data where the check box column will be typeof(ToggleState
). Thus, for all DBNull values you can use ToggleState.Indeterminate.
I hope this information helps. Should you have further questions, I would be glad to help.
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.