I was able to setup my table and put fields on a form - no problems. 

I decided to add a couple of fields and the deployment to the server fails - b/c "Allow Null" is not checked (like the other fields.)  If I check the field - the deployment works - but the app fails with a "Conversion from type 'DBNull' to type 'String' is not valid."

Just need someone to tell me where I messed up and how to fix it - thanks!

HB