adding Lines to Xml file At Specific location

I have an xml file "message.xml" in which messages are written like :-

< messages>

< message id="1" name="last" text="welcome All"/>

-..

-..

-..

< message id="10" name="first" text="welcome"/>

< /message>

Now i have开发者_开发问答 to add message lines after last message each time through my program,

the problem is how to find the last line or place where i have to add the lines (like just before< /message> tag) ??

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You could use a XDocument to manipulate XML files:

XDocument
    .Load("test.xml")
    .Root
    .Add(
        new XElement(
            "message", 
            new XAttribute("id", "123"),
            new XAttribute("name", "foo"),
            new XAttribute("text", "bar")
        )
    )
    .Save("test.xml");

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Load the file into an XmlDocument (or an XDocumnent). Then you can add new message elements to the root messages element. Then resave it. No need to do text-file editing.