XML writing

Question

Hi,

I am writing a code to get an XML file as follows.
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<?xml version="1.0" ?>
<channel>
<item>
<title>Mark</title>
<description>2001,Denton Rd., Lewisville, TX</description>
</item>
<geo:lat>43.646870</geo:lat>
<geo:long>-79.383342</geo:long>
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I am using the following code.

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XmlTextWriter textWriter = new XmlTextWriter("C:\\temp\\AMXmlFile.xml", Encoding.UTF8);
textWriter.Formatting = Formatting.Indented;
textWriter.Indentation = 4;
textWriter.WriteStartDocument();
textWriter.WriteStartElement("channel", "");
textWriter.WriteStartElement("item", "");
textWriter.WriteStartElement("title", "");
textWriter.WriteString("Mark");
textWriter.WriteEndElement();
textWriter.WriteEndElement();
textWriter.WriteStartElement("desription", "");
textWriter.WriteString("4352,plano rd.");
textWriter.WriteEndElement();
textWriter.WriteStartElement("geo\":\"lat","");
textWriter.WriteString("43.646870");
textWriter.WriteEndElement();
// Ends the document.
textWriter.WriteEndElement();
textWriter.WriteEndDocument();
// close writer
textWriter.Flush();
textWriter.Close();
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I am getting an error in the line
textWriter.WriteStartElement("geo\":\"lat","");
What do I need to write in my code to have the following line in my XML file.
<geo:lat>43.646870</geo:lat>

I have tried the following also, but it didn't work.
xmlWriter.WriteStartElement("geo:lat");
xmlWriter.WriteString("43.646870");
xmlWriter.WriteEndElement();
Also I am not able to get the line <rss version="0.92" xml:base="http://www.primaryobjects.com">.
What I need to write to get the solution of my above problems. I will appreciate your help.
Thanks.