Adding Build number in the Assembly

You can specify your complete version structure using the assembly-level attribute System.Reflection.AssemblyVersionAttribute, please see:
http://msdn.microsoft.com/en-us/library/system.reflection.assemblyversionattribute.aspx[^].

Usually you have this attribute auto-generated when you create any project from template in your file "AssemblyInfo.cs". Here is how it looks:

using System.Reflection;

//...

[assembly: AssemblyVersion("1.32.12.11")]
// build number here is 12

You extract this structure using Reflection from any assembly. If you need an assembly of your application, you usually need an entry assembly, the one loaded first, having an entry point and referencing all other assemblies and executable module. To get it, use System.Reflection.Assembly.GetEntryAssembly(), but you can get this version information from any assembly you need. Please see:
http://msdn.microsoft.com/en-us/library/system.reflection.assembly.aspx[^].

In your code, you need to get the version attribute using System.Reflection.Assembly.GetCustomAttributes(System.Type, bool), please see:
http://msdn.microsoft.com/en-us/library/88d17d13.aspx[^].

For example:

System.Reflection.AssemblyVersionAttribute GetAssemblyVersion(System.Reflection.Assembly assembly) {
    object[] attributes = assembly.GetCustomAttributes(typeof(System.Reflection.AssemblyVersionAttribute), false);
    if (attribute == null) return null;
    if (attrubutes.Length < 1) return null; //assembly is not versioned
    System.Reflection.AssemblyVersionAttribute attrubute = (System.Reflection.AssemblyVersionAttribute)attributes[0];
    return new System.Reflection.AssemblyVersionAttribute(attribute.Version);
} //GetAssemblyVersion

If this method returns null, it indicated that the assembly is not given a version. If this is not null, use the value in your display or elsewhere.

—SA