See the AssemblyInfo.cs (or .vb) file in your project. This is created with
a default set of assembly-wide attributes for AssemblyVersion as well as
description, companyname etc information. By default your assembly (dll or
exe) is given the version 1.0.* which means the build number is incremented
automatically each time you build the project and the major and minor
versions are fixed at 1.0.
Peter