Null Reference not set to an instance of an object

> System.Web.Security.Membership.GetUser(object, bool)' is a 'method' but is used like a 'type'

that is because of the new keyword on the method GetUser and that cannot be done. Try the following:

Would I put this right above the code where I have the error?

So how would I do this given that I have the following as code on my page?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;
using SMMC.IT.BusinessObjects;
using SMMC.IT.DataDefinition.EntityObjects;


namespace SMMC.IT.Web.UI
{
    public class Global : System.Web.HttpApplication
    {

        protected void Application_Start(object sender, EventArgs e)
        {

        }

        protected void Session_Start(object sender, EventArgs e)
        {

        }

        protected void Application_BeginRequest(object sender, EventArgs e)
        {

        }

        protected void Application_AuthenticateRequest(object sender, EventArgs e)
        {

        }

        protected void Application_Error(object sender, EventArgs e)
        {
            Exception oErr = Server.GetLastError().GetBaseException();
            CommonSystem oCommon = new CommonSystem();
           
            CommonDataSet.ErrorLogDataTable dtLog = new CommonDataSet.ErrorLogDataTable();
            CommonDataSet.ErrorLogRow drLog = (CommonDataSet.ErrorLogRow) dtLog.NewErrorLogRow();
           

            drLog.UserName = Membership.GetUser().UserName;
            drLog.ErrorMsg = oErr.Message.ToString();
            drLog.StackTrace = oErr.StackTrace.ToString();
            dtLog.AddErrorLogRow(drLog);
            oCommon.InsertErrorLog(dtLog);

            Server.ClearError();
            System.Web.HttpContext.Current.Response.Redirect("ErrorPage.htm", true);
           
        }

        protected void Session_End(object sender, EventArgs e)
        {

        }

        protected void Application_End(object sender, EventArgs e)
        {

        }
    }
}

Does anybody have an idea?

So where would I place this code that you sent me in the large block of code that I sent out?  Please let me know, thank you!

Like I said earlier, on the line that's shining up with the error. In other words:

    drLog.UserName = Membership.GetUser().UserName;

It worked, you are the MAN!  Thank you so much!!

Your answer helped me very much, once again.  Thank you!

You're welcome, glad I could be of some help ;)