[Solved] Writing XML with colon in Node and Element name in XML using C# .Net

Please refer the follwing.

Ref

http://msdn.microsoft.com/en-us/library/c22k3d47.aspx

Initial XML

<?xml version="1.0" encoding="utf-8"?>
<Details>
</Details>

C#

protected void Page_Load(object sender, EventArgs e)
{
    string filename = Server.MapPath("~/XMLFile.xml");
    XmlDocument doc = new XmlDocument();
    doc.Load(filename);
    XmlNode node = doc.CreateNode(XmlNodeType.Element, "Data", null);
    XmlNode nodeName = doc.CreateElement("Student", "FirstName", "Student:FirstName");
    nodeName.InnerText = "Name";
    XmlNode nodeAge = doc.CreateElement("Student", "Age", "Student:Age");
    nodeAge.InnerText = "25";
    node.AppendChild(nodeName);
    node.AppendChild(nodeAge);
    doc.DocumentElement.AppendChild(node);
    doc.Save(filename);
}

XML data when page is running

<?xml version="1.0" encoding="utf-8"?>
<Details>
  <Data>
    <Student:FirstName xmlns:Student="Student:FirstName">Name</Student:FirstName>
    <Student:Age xmlns:Student="Student:Age">25</Student:Age>
  </Data>
</Details>

If you do not want to have the colon the refer this code

protected void Page_Load(object sender, EventArgs e)
{
    string filename = Server.MapPath("~/XMLFile.xml");
    XmlDocument doc = new XmlDocument();
    doc.Load(filename);
    XmlNode node = doc.CreateNode(XmlNodeType.Element, "Data", null);
    XmlNode nodeName = doc.CreateElement( "FirstName",null);
    nodeName.InnerText = "Name";
    XmlNode nodeAge = doc.CreateElement( "Age", null);
    nodeAge.InnerText = "25";
    node.AppendChild(nodeName);
    node.AppendChild(nodeAge);
    doc.DocumentElement.AppendChild(node);
    doc.Save(filename);
}

Xml format

<?xml version="1.0" encoding="utf-8"?>
<Details>
  <Data>
    <FirstName>Name</FirstName>
    <Age>25</Age>
  </Data>
</Details>