using System;
namespace Morpheusweb.Utils
{
[AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
 public sealed class ExtraAssemblyInfoAttribute : Attribute
 {
  public ExtraAssemblyInfoAttribute(string ExtraAssemblyInfo)
  {
   _ExtraAssemblyInfo = ExtraAssemblyInfo;
  }
  
  public string ExtraAssemblyInfo
  {
   get
   {
    return _ExtraAssemblyInfo;
   }
  }
  
  private string _ExtraAssemblyInfo;
 }
}

File AssemblyInfo.cs
[assembly: ExtraAssemblyInfo("Info1")]
[assembly: ExtraAssemblyInfo("Info2")]
[assembly: ExtraAssemblyInfo("Info3")]

Lettura dati:
public static List GetExtraAssemblyInfo(string AssemblyName)
{
 List info = new List ();
 Type t = null;
 Assembly a = string.IsNullOrEmpty(AssemblyName)
      ? Assembly.GetEntryAssembly()
      : Assembly.LoadFile(AssemblyName);
 if (a != null)
  t = a.EntryPoint.ReflectedType;
 if (t != null)
 {
  object[] attr = t.Module.Assembly.GetCustomAttributes(typeof (ExtraAssemblyInfoAttribute), false);
  if ((attr.Length > 0))
  {
   for (int i = 0; i < attr.Length; i++)
    info.Add(((ExtraAssemblyInfoAttribute) attr[i]).ExtraAssemblyInfo);
  }
 }
 return info;
}