Question

Here in my code DR.HasRows() returns True, but DR("LastID") returns DBNUll while SELECT IDENT_CURRENT ('SiteSection') AS 'LastID' works in SQL Management Studio.

__SQLString= "SELECT IDENT_CURRENT ('SiteSection') AS 'LastID'"
Dim DR As SqlDataReader
ddConnect() 'It's my custom class that opens a connection to db, it works
DR = ddExecuteReader()
DR.Read()
If DR.HasRows() Then
    GetLastID = DR("LastID")
End If

Answer 1

I suspect that the account your .NET application is using does not have the same permissions as the account you are using to connect via Management Studio.

That said, I find your approach questionable at best. What are you planning to do with the information that comes from IDENT_CURRENT()? If you think that you can take that and make assumptions about what IDENTITY value is going to be generated for an INSERT that you have not performed yet, please think again. Several factors can invalidate that assumption – someone can reseed the identity in the meantime, or change the increment, or insert a bunch of rows.

So I suggest you reconsider what exactly you need to do and why you think IDENT_CURRENT is the way to do it. Based on your comment, you should be sending:

INSERT ... ; SELECT LastID = SCOPE_IDENTITY();

Now you can be sure that this is the ID you’ve inserted.