How do I sort a listbox by multiple values

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C#

Hi Guys

Currently i have an issue trying to sort a listbox, issue i am having is i have tried to sort by the attributes but not having any luck

I need to do the sort on 3 different attributes
sort by

Attribute1

then

Attribute2

then

Attribute3

but having no luck

What I have tried:

public class CustomComparer : System.Collections.IComparer
       {
           public int Compare(object x, object y)
           {
               RadListBoxItem p1 = new RadListBoxItem();
               RadListBoxItem p2 = new RadListBoxItem();
               if (x is RadListBoxItem)
                   p1 = x as RadListBoxItem;
               else
                   throw new ArgumentException("Object is not of type RadListBoxItem.");
               if (y is RadListBoxItem)
                   p2 = y as RadListBoxItem;
               else
                   throw new ArgumentException("Object is not of type RadListBoxItem.");
               int cmp = 0;
               if (p1.ListBox.Sort == RadListBoxSort.Ascending)
               {
                   //here we compare the Values of the items
                   if (String.Compare(p1.Value, p2.Value, !p1.ListBox.SortCaseSensitive) == 0)
                   {
                       return 0;
                   }
                   if (String.Compare(p1.Attributes["Attribute1"], p2.Attributes["AgentHierachy"], !p1.ListBox.SortCaseSensitive) == 0)
                   {
                       return 0;
                   }
                   if (String.Compare(p1.Attributes["Attribute2"], p2.Attributes["SubAgentID"], !p1.ListBox.SortCaseSensitive)==0)
                   {
                       return 0;
                   }

               }
               if (p1.ListBox.Sort == RadListBoxSort.Descending)
               {
                   //here we compare the Values of the items
                   cmp = String.Compare(p1.Value, p2.Value, !p1.ListBox.SortCaseSensitive) * -1;
               }
               return cmp;
           }