Why can't I insert data into local database (SQL Compact Edition) with C#?

Question

I am doing a project on Visual Studio. I am using a local database (empty sql server compact edition). I chose Dataset and created my table (Images). It has a primary autoin

Answer 1

SqlCeConnection conn = new SqlCeConnection(@"Data Source = c:\FullPath") 

How to get full path: in solution explorer Right click on .Sdf then get fullPath.