If you want the Visual Studio 2005 text editor to show you the line numbers all you have to do is to expand the Text Editor branch of the tree. Here you can see a list of all of the languages for which settings may be modified. We will enable line numbering for C# code editing. Expand the C# node of the tree and select the General section to reveal the settings. To enable source code line numbering, tick the appropriate check box. Click OK to accept the setting and the line numbers will appear.