I have a problem with the
XmlTextWriter.WriteProcessingInstruction method. This
method takes two parameters:

[C#]
public override void WriteProcessingInstruction(
  string name,
  string text
);

Remarks
If text is either a null reference (Nothing in Visual
Basic) or String.Empty, this method writes a
ProcessingInstruction with no data content, for example <?
name?>.

So i tried to write a processing instruction with the
parameter text set to null. What i got wasn't what i
expected: <?name ?>. This format is not well formed.

Is this a bug or do someone have an advice for correcting
the problem?

Here a small testprogramm:

using System;
using System.IO;
using System.Xml;

public class Sample
{
    private const string filename = "testPI.xml";

    public static void Main()
    {
        XmlTextWriter writer = null;

        writer = new XmlTextWriter (filename,
null);
        //Use indenting for readability.
        writer.Formatting = Formatting.Indented;

        //Write the XML delcaration.
        writer.WriteStartDocument();

        //Write the ProcessingInstruction node.
        writer.WriteProcessingInstruction("name",
null);
   
        //Write a root element.
        writer.WriteStartElement("book");

        //Write the genre attribute.
        writer.WriteAttributeString
("genre", "novel");

        //Write the close tag for the root element.
        writer.WriteEndElement();

        //Write the XML to file and close the
writer.
        writer.Flush();
        writer.Close();  

        //Load the file into an XmlDocument to
ensure well formed XML.
        XmlDocument doc = new XmlDocument();
        //Preserve white space for readability.
        doc.PreserveWhitespace = true;
        //Load the file.
        doc.Load(filename);  
   
        //Display the XML content to the console.
        Console.Write(doc.InnerXml);  

        Console.ReadLine();
    }
}