I have a really basic table called Category in a service based database, looking like this:
CategoryID: Primary key, identity
CategoryName: Just an nvarchar(max) column
I have added a LINQ To SQL class to the project, and initialized it right before my form's constructor:
DataClasses1DataContext dc = new DataClasses1DataContext();
var c = new Category()
CategoryName = "test"
Found the problem (kinda). The code works perfectly well with Visual Studio 2013, therefore I'm fairly sure the problem is with VS2015.