Opening pdf from external C# application

I have been trying to get a pdf to open consistently in my Winform app's window with the following code:

AcroApp app = new AcroApp();

            AcroAVDoc avDoc = new AcroAVDoc();

            string myPath = "C:\\Users\\Jeff\\SkyDrive\\";

            string myFile = "Child Support Data Sheet, Lake County.pdf";

            //bool success = pdfDoc.Open(myPath + myFile, myFile);

            app.Lock("Jeff's Program");

            bool success = avDoc.OpenInWindowEx(myPath + myFile, this.Handle.ToInt32(),

                (int)Acrobat.AVOpenParams.AV_DOC_VIEW, 1, 0, (short)Acrobat.PDViewMode.PDFullScreen,

                (short)Acrobat.AVZoomType.AVZoomFitWidth, 0, 0, 0);

            // bool success = app.Show();

            MessageBox.Show(success.ToString());

            avDoc.Close(0);

            app.UnlockEx("Jeff's Program");

For whatever reason, it does not work most of the time.  The Form1 window is blank, although sometimes, it contains the pdf.  I have been trying to deal with that, but I have a more important question, first.  Even if I get it working correctly, will it work on computers where end-users only have Acrobat Reader?  If not, I need to look for another way.  If it will work, I need to keep debugging (so does anyone have any suggestions)?