Determine the logged in user

Some time ago I wrote a post around how to show and hide fields based on the logged in user. Apparently this doesn't work for Dynamics CRM 4.0 anymore for two reasons. This post will help you to get it working again.The first one is that you are not allowed to use the <%= approach anymore. You do now have to use the function: Page.Response.Write(string strText);The second reason is that the