Form1

gistfile1.cs

private string sDataSource = "data.xml";
private string sTemplateFile = "template.tx";

private void mergeToolStripMenuItem_Click(object sender, EventArgs e)
{
    // convert the XML file to a .NET DataSet
    DataSet ds = new DataSet();
    ds.ReadXml(sDataSource, XmlReadMode.Auto);

    // create a new DataSelector instance
    DataSelector selector = new DataSelector(ds,
        File.ReadAllBytes(sTemplateFile));

    // load the modified template
    mailMerge1.LoadTemplateFromMemory(selector.Template,
        TXTextControl.DocumentServer.FileFormat.InternalUnicodeFormat);
    // merge the template with the new, sorted data source
    mailMerge1.Merge(ds.Tables[0]);

    // copy the merged document into a visible TextControl object
    byte[] data = null;
    mailMerge1.SaveDocumentToMemory(out data,
        TXTextControl.BinaryStreamType.InternalUnicodeFormat, null);
    textControl1.Load(data,
        TXTextControl.BinaryStreamType.InternalUnicodeFormat);
}