Creating Xml from checked items then populating treeview C#

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C#3.0

C#

WinForms

Hi,

I have checkedlistbox in form1. Based on the checked items I am trying to create xml and populate same in treeview..

Following is my code:-

XmlElement elmRoot = xdoc.CreateElement("Media");

foreach (FileInfo i in opt.checkedListBox1.Items)
{

    XmlElement elmfile = xdoc.CreateElement("File");

    XmlElement elmtitle = xdoc.CreateElement("Title");
    XmlText txt_title = xdoc.CreateTextNode(i.Name.ToString());

    elmRoot.AppendChild(elmfile);
    elmRoot.LastChild.AppendChild(elmtitle);
    elmRoot.LastChild.LastChild.AppendChild(txt_title);

    XmlElement elm_file_path = xdoc.CreateElement("Full-Path");
    XmlText txt_file_path = xdoc.CreateTextNode(i.FullName.ToString());

    elmRoot.LastChild.AppendChild(elm_file_path);
    elmRoot.LastChild.LastChild.AppendChild(txt_file_path);


    XmlElement elmext = xdoc.CreateElement("Extension");
    XmlText txt_ext = xdoc.CreateTextNode(i.Extension.ToString());

    elmRoot.LastChild.AppendChild(elmext);
    elmRoot.LastChild.LastChild.AppendChild(txt_ext);

}

xdoc.Save("treeviewxml.xml");

but am getting following exception:-

Invalid XML document, The document does not have a root element..

Any help is greatly appreciated.

Thanks.