I presume your talking about the code below?
SPSite oSiteCollection = SPContext.Current.Site;
using (SPWeb oWebsite = oSiteCollection.AllWebs["Website_Name"])
{
SPUser oUser = oWebsite.AllUsers["User_Name"];
string E-mail_Address = oUser.Email;
string Display_Name = oUser.Name;
string User_Notes = oUser.Notes;
string cutomProp = oUser.CustomeMade;
}
did you add to Microsoft.SharePoint.SPUser? if you have, build save the Microsoft.SharePoint.SPUser. In your project add reference to the new dll (navigate to the folder and goto the bin folder with the updates).
You should now see your changes in the project ;)...... that is if it what your looking for ;)
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spuser.aspx
hope it helps :)