test.cs

using TXTextControl;

using (ServerTextControl tx = new ServerTextControl())
{
    tx.Create();

    // Add a header
    tx.Sections.GetItem().HeadersAndFooters.Add(HeaderFooterType.Header);

    // Get the header/footer object
    HeaderFooter headerFooter = tx.Sections.GetItem().HeadersAndFooters.GetItem(HeaderFooterType.Header);

    // Add an image to the header
    Image image = new Image("tx_logo.svg", 0);
    headerFooter.Images.Add(image, HorizontalAlignment.Right, 1, ImageInsertionMode.AboveTheText);

    // Add a text to the header
    headerFooter.Selection.Text = "Header Text\r\n\r\n";

    // Add a page number field to the header
    headerFooter.Selection.Text = "Page ";
    headerFooter.PageNumberFields.Add(new PageNumberField());
    headerFooter.Selection.Text = " of ";
    headerFooter.PageNumberFields.Add(new PageNumberField() { ShowNumberOfPages = true });

    // Add a new page
    tx.Selection.Text = "\f";

    // Save the document
    tx.Save("results.docx", StreamType.WordprocessingML);
}