passing an xml file so it can be saved elde where

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C#

ADO.NET

hey guys, quick question thats been bugging me for a few hours.

i can retrieve an xml file from a directory that i specify really easy, i store this in a dataset to be passed to a datagrid etc..

now what im trying to do is save this exact file as it stands to a different directory, and i just cant figure it out, im trying to pass the current dataset to this object so that when i click the save button, it will save this xml file, say, on my desktop.

this is the code im using to save the file on desktop:

private void XMLpathBTN_Click(object sender, EventArgs e)
        {
            string myXMLFile = "F:\\year2\\Data Cent Win Prog\\Assignemnt 2\\Assignment2\\Assignment2\\Books.xml";

            SaveFileDialog saveFile = new SaveFileDialog();

            saveFile.DefaultExt = "xml";
            saveFile.AddExtension = true;
            saveFile.InitialDirectory = @"C:\Users\Matthew\Desktop\";
            saveFile.OverwritePrompt = true;
            saveFile.Title = "Save as XML File";
            saveFile.FileName = "copiedXML";
            saveFile.ValidateNames = true;


            if (saveFile.ShowDialog() == DialogResult.OK)
            {

                ds.WriteXml(saveFile.FileName, XmlWriteMode.WriteSchema);
            }
        }

i know why its writing a blank dataset is because there is nothing in it, i want to pass the data from the load click event to this event so it has the same data ready from copying, ill post the load event aswell:

private void importXML_Click(object sender, EventArgs e)
        {           

            OpenFileDialog loadXMLFile = new OpenFileDialog();

            BindingSource bs = new BindingSource();

            loadXMLFile.DefaultExt = "xml";
            loadXMLFile.AddExtension = true;
            loadXMLFile.InitialDirectory = @"F:\year2\Data Cent Win Prog\Assignemnt 2\Assignment2\Assignment2\Books.xml";
            loadXMLFile.Title = "Loan an XML File";
            loadXMLFile.FileName = "Books";//importXMLTB.Text = @"F:\year2\Data Cent Win Prog\Assignemnt 2\Assignment2\Assignment2\Books.xml";
            loadXMLFile.ValidateNames = true;


            if (loadXMLFile.ShowDialog() == DialogResult.OK)
            {
                importedDS.ReadXml(loadXMLFile.FileName, XmlReadMode.InferTypedSchema);

                bs.DataSource = importedDS.Tables[0];

                DGTables.DataSource = bs;
            }

        }

just want to pass the above file to the save button file but i cant figure it out
Please help
Thanks
Matt.