I have done very little in C# and am following the Head First C# book. There\'s a part in the book where it asks me to create a Database Diagram for my SQL database, but in the
I like the way Entity Framework 5 will allow you to import database objects and then it will diagram the tables, indexes, relationships, etc. Or you can do it the other way, create the diagrams and then publish it to a database. This works so well I suspect it is why the Database Diagram was dropped in SQL Server. EF5 is probably in your Visual Studio environment right now.
To create an EF5 diagram, right click a directory (usually the directory is named "Model"), and select "Add" / "New Item" and then select "ADO.NET Entity Data Model". Name it, and then select "Generate from database". The rest is selecting or generating a connection string and then selecting the database objects.
Best part is that this is the start of what I would recommend when you get to the point in your learning where you need a data access layer, I can not recommend EF5 high enough.