I have an EntityDataSource on a web form. This datasource has a Where clause set to filter for certain records from my database. I've added another clause that checks for null values, but this does not work.
See my example code with the check for null added. It returns no records, but there are three such records that have the SourceType set to 'admin' and where the TargetID is null.
Where="(it.SourceType == 'Admin') && (it.TargetID == null)"