Hi, problem with inserting image into XML file..

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ASP.NET

I have uploaded the image by using FileUpload control into Image Control.
and Now my I have to save the same image into already existed xml file..
And then I have to read all the Images in XMl File and display those in gridview.. Can anbody help?

What I have tried:

protected void btn_Create_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {

            string filename = System.IO.Path.GetFileName(FileUpload1.FileName);

            FileUpload1.SaveAs(Server.MapPath("~/Images/") + filename);

            /*Uploaded file path*/

            string filePath = "Images/" + filename;
            /*Code to save the file path into data base*/
            lblDisplay.Text = "File uploaded successfully.";

            Image1.ImageUrl = filePath;

        }

        else
        {

            lblDisplay.Text = "Please select file.";

        }

I have tried like this. Till then its working fine. I don't know wt I have to do next...?