DicomObjects.NET

    
 // ZoomMode enum values supported by the PDF viewer
 private enum ZoomMode
 {
    FitPage = 0,        // Make the page to fit on the display either vertical or horizontal.
    FitWidth = 1,       // Make the page to fit on the display only horizontal.
    FitHeight = 2,      // Make the page to fit on the display only vertical.
    ActualSize = 3,     // Shows the page in its actual size.
    ZoomPercent = 4     // Shows the page at a zoom factor specified by the user.
 } 
 
 [DllImport("psapi.dll", SetLastError = true)]
 static extern bool EnumProcessModules(IntPtr hProcess, [Out] IntPtr[] lphModule, int cb, out int lpcbNeeded);

 [DllImport("psapi.dll", SetLastError = true)]
 static extern uint GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, [Out] StringBuilder lpFilename, int nSize);
 
 // Try to locate the ceteDynamic PDF assembly
 private static List<string> GetNativeModules()
 {
    var process = Process.GetCurrentProcess();
    IntPtr[] modules = new IntPtr[1024];
    int bytesNeeded;

    if (!EnumProcessModules(process.Handle, modules, modules.Length * IntPtr.Size, out bytesNeeded))
        return null;

    int count = bytesNeeded / IntPtr.Size;
    List<string> strings = new List<string>();

    for (int i = 0; i < count; i++)
    {
        StringBuilder sb = new StringBuilder(1024);
        GetModuleFileNameEx(process.Handle, modules[i], sb, sb.Capacity);
        if (sb.ToString().Contains("DPDFViewerNative"))
            strings.Add(sb.ToString());
    }

    return strings;
 }
 
 // sample routine to change Zoom mode
 private void ChangeZoomMode()
 {
    if (Viewer.Controls.Count > 0)
    {
        var pdfViewer = Viewer.Controls[0];
        var names = GetNativeModules();
        if (names.Any())
        {
            var assembly = Assembly.LoadFrom(names.First());
            Type pdfviewerType = assembly.GetType("ceTe.DynamicPDF.Viewer.PdfViewer");

            PropertyInfo ZoomModeProperty =
            pdfviewerType.GetProperty("ZoomMode", BindingFlags.Public | BindingFlags.Instance);
            if (ZoomModeProperty != null && ZoomModeProperty.CanWrite)
                ZoomModeProperty.SetValue(pdfViewer, ZoomMode.FitPage, null);
        }
    }
}