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XmlTextWriter LookupPrefix returns the closest prefix in the current namespace scope

using System; using System.IO; using System.Xml; public class Sample {   private const string filename = "sampledata.xml";   public static void Main()   {      XmlTextWriter writer = new XmlTextWriter (filename, null);      writer.Formatting = Formatting.Indented;      writer.WriteComment("sample XML fragment");      writer.WriteStartElement("bookstore");      writer.WriteAttributeString("xmlns", "bk", null, "urn:samples");      writer.WriteStartElement("book");      string prefix = writer.LookupPrefix("urn:samples");      writer.WriteStartAttribute(prefix, "ISBN", "urn:samples");      writer.WriteString("1-111111-11");      writer.WriteEndAttribute();           writer.WriteStartElement("title");      writer.WriteString("C#");      writer.WriteEndElement();      writer.WriteElementString("price", "19.95");      writer.WriteStartElement(prefix, "style", "urn:samples");      writer.WriteString("hardcover");      writer.WriteEndElement();      writer.WriteEndElement();      writer.WriteEndElement();      writer.Flush();      writer.Close();      XmlDocument doc = new XmlDocument();      doc.PreserveWhitespace = true;      doc.Load(filename);      Console.Write(doc.InnerXml);     } }