test.cs

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

    TXTextControl.Selection selection = new TXTextControl.Selection();
    selection.Text = "Hello PDF!";
    selection.FontSize = 360;
    selection.FontName = "Arial";
    selection.ForeColor = System.Drawing.Color.Red;

    tx.Selection = selection;

    TXTextControl.SaveSettings saveSettings = new TXTextControl.SaveSettings()
    {
        UserPassword = "textcontrol"
    };

    tx.Save("output.pdf", TXTextControl.StreamType.AdobePDF, saveSettings);
}