SQL Server Newbie -- Auto Increment

I recently converted my Access 2007 to SQL Server Express 2012.  Just about everything is going fine ... except My Primary Key and Auto-increment.
In Access...I had a column usually called ID and this would auto increment as new records were added.  From a coding perspective I never touched it   However, now when I add new records I'm getting an error message that implies nothing is being inserted into the ID column and of course nulls are not allowed.  I went in (GUI) and changed the column to Primary Key and set Yes as Identity.  But this still didn't help.

BTW...code is in VBnet

Any ideas???

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