Insert watermark into pdf on mouse clicks

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C#

I have Adobe X1 SDK. And I am trying to add a watermark to a pdf. There is an example in c# that comes with the SDK, here watermark is inserted on the top of the first page, I need to insert the watermark on mouse click, that is wherever i click the mouse i want this watermark to be inerted on the pdf document.


Here is the original Adobe sample code

private void addWatermarkButton_Click(object sender, EventArgs e)
{
            String filter = "PDF Files (*.pdf)|*.PDF|" +
              "All files (*.*)|*.*";
            String filename = chooseFile(filter);
            if (filename != null && g_AVDoc.IsValid())
            {
                CAcroPDDoc pdDoc = (CAcroPDDoc)g_AVDoc.GetPDDoc();
                 //Acquire the Acrobat JavaScript Object interface from the PDDoc object
                Object jsObj= pdDoc.GetJSObject();

               /* Add a watermark from a file. 
                * See the readme for a discussion on InvokeMember.
                function prototype:
                  addWatermarkFromFile(cDIPath, nSourcePage, nStart, nEnd, bOnTop, bOnScreen, bOnPrint, nHorizAlign, nVertAlign, nHorizValue, nVertValue, bPercentage, nScale, bFixedPrint, nRotation, nOpacity)
               */
                object[] addFileWatermarkParam = { filename, 0, 0, 0, true, true, true, 0, 3, 10, -10, false, 0.4, false, 0, 0.7 };

                Type T = jsObj.GetType();
                T.InvokeMember(
                        "addWatermarkFromFile",
                        BindingFlags.InvokeMethod |
                        BindingFlags.Public |
                        BindingFlags.Instance,
                        null, jsObj, addFileWatermarkParam);

                //get current time and make a string from it
                System.DateTime currentTime = System.DateTime.Now;

                /* make a color object */
                Object colorObj = T.InvokeMember(
                        "color",
                        BindingFlags.GetProperty |
                        BindingFlags.Public |
                        BindingFlags.Instance,
                        null, jsObj, null);
                Type colorType = colorObj.GetType();
                Object blueColorObj = colorType.InvokeMember(
                        "blue",
                        BindingFlags.GetProperty |
                        BindingFlags.Public |
                        BindingFlags.Instance,
                        null, colorObj, null);

                /* Add a text watermark.
                ' function prototype:
                '   addWatermarkFromText(cText, nTextAlign, cFont, nFontSize, color, nStart, nEnd, bOnTop, bOnScreen, bOnPrint, nHorizAlign, nVertAlign, nHorizValue, nVertValue, bPercentage, nScale, bFixedPrint, nRotation, nOpacity)
                */
                 object[] addTextWatermarkParam = { currentTime.ToShortTimeString(), 1, "Helvetica", 100, blueColorObj, 0, 0, true, true, true, 0, 3, 20, -45, false, 1.0, false, 0, 0.7 };
                T.InvokeMember(
                        "addWatermarkFromText",
                        BindingFlags.InvokeMethod |
                        BindingFlags.Public |
                        BindingFlags.Instance,
                        null, jsObj, addTextWatermarkParam);              
            }
}