Answer by Martin Honnen for Using LINQ to XML how can I group element on the basis of its value?

Try along the following lines:

var groups = from record in xmldoc.Descendants("record")             group record by (string)record.Element("collection") into g             select new {               key = g.Key,               count = g.Count()             }foreach (var group in groups){  Response.Write("Collection "+ group.key +" has "+ group.count +" member(s).");}