Thought I would share how to show line numbers for the code editor in Microsoft Visual C# Express because it is less than intuitive. My personal opinion is that the numbers should show by default. It makes a ton of sense to display error locations by line number, but not actually show the line numbers in the code editor.
Anyways, in the top navigation open tools > options dialog. In the dialog make sure you first check the ‘Show all settings’ checkbox in the lower left corner. Now expand the ‘Text Editor’ menu item. Click ‘All Languages’. Lastly check the ‘Line numbers’ checkbox in the options. It should really not be this complicated.