Error - Operation is not valid due to the current state of the object. SPListItem and RunWithElevatedPrivileges

When trying to update a SPListItem inside a SPSecurity.RunWithElevatedPrivileges block, you will received the following error: Operation is not valid due to the current state of the object.

So if you are doing something like this:

SPSecurity.RunWithElevatedPrivileges(delegate()
               {
                   using (SPWeb web = new SPSite(sURL).OpenWeb())
                   {
                       SPList list = web.Lists["MyList"];
                       //add a folder
                       SPListItem listItem = list.Items.Add(list.RootFolder.ServerRelativeUrl, SPFileSystemObjectType.Folder, sFolderName);

                       listItem.Properties["Name"] = sFolderName;

                       listItem.Update(); //and boom goes the dynamite!
                   }
               }
        );

You will now have to switch it up and do something like this:

SPWeb web = null;
        try
        {
            SPSecurity.RunWithElevatedPrivileges(delegate()
             {
                 using (SPSite site = new SPSite(sURL))
                 {
                     web = site.OpenWeb();
                 }
             }
            );

            SPList list = web.Lists["MyList"];
            //add a folder
            SPListItem listItem = list.Items.Add(list.RootFolder.ServerRelativeUrl, SPFileSystemObjectType.Folder, sFolderName);

            listItem.Properties["Name"] = sFolderName;
            listItem.Update(); //update is successful
        }
        catch
        {
        }
        finally
        {
            web.Dispose();
        }

Only setting the SPWeb object in the RunWithElevatedPrivileges block will avoid this error from happening.