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Read XML from a String in C#.NET using FileStream

//Name space reference 
using System.Xml;
using System.IO;
//System.Xml dll
FileStream fs = new FileStream(path, FileMode.Open, 
FileAccess.Read, FileShare.ReadWrite);
      xmldoc = new XmlDocument();
      xmldoc.Load(fs);

Read XML from a String in C#.NET using StringReader

XmlReader reader = XmlReader.Create(new StringReader(xmlString)) ; 
  while(reader.Read())
  {
       //do something 
  }