What are you using to insert into your database? You can't insert into SQL Server directly, you need a tool or a client program that connects to the database and issues SQL statements.
An ADO.NET program, SQL Server Management Studio, A stored procedure written in .NET, or something else.
And are you using the same mechanism to update?
And is the client running on the same machine as SQL Server or a different machine?
This sounds like more of a setup issue or a tools issue than a SQLCLR issue, but perhaps we could point you in the right direction.
Cheers, Bob