private void convert(string input, string output)
        {

            output = @"C:\show%03d.png";
            Utils utils = new Utils();
            string path = System.IO.Path.Combine(utils.getStartupPath(), "gsdll32.dll");

            // create a new GhostscriptVersionInstance with a custom dll path
            // if you are running on 64 bit machine, make sure you use gsdll64.dll
            GhostscriptVersionInfo gvi = new GhostscriptVersionInfo(
                new Version(),
                @"" + path,
                string.Empty,
                GhostscriptLicense.GPL);

            GhostscriptPngDevice dev = new GhostscriptPngDevice(GhostscriptPngDeviceType.Png16m);
            dev.GraphicsAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
            dev.TextAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
            dev.ResolutionXY = new GhostscriptImageDeviceResolution(96, 96);
            dev.InputFiles.Add(@input);
            //dev.InputFiles.Add(@input);
            dev.Pdf.FirstPage = 1;
            dev.Pdf.LastPage = int.MaxValue;


            dev.CustomSwitches.Add("-g1280x752>");
            dev.CustomSwitches.Add("-dFitPage");

            dev.OutputPath = @output;
            //dev.OutputPath = @output;

            // make sure you pass GhostscriptVersionInfo to the device
ERROR >>>>>>dev.Process(gvi, true, null);

        }



System.AccessViolationException was unhandled
  HResult=-2147467261
  Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
  Source=Ghostscript.NET
  StackTrace:
       at Microsoft.WinAny.Interop.DynamicNativeLibrary.CallDllEntryPoint(MEMORY_MODULE* memory_module, UInt32 fdwReason)
       at Microsoft.WinAny.Interop.DynamicNativeLibrary.MemoryLoadLibrary(Byte[] data)
       at Microsoft.WinAny.Interop.DynamicNativeLibrary..ctor(Byte[] buffer)
       at Ghostscript.NET.GhostscriptLibrary..ctor(GhostscriptVersionInfo version, Boolean fromMemory)
       at Ghostscript.NET.Processor.GhostscriptProcessor..ctor(GhostscriptVersionInfo version, Boolean fromMemory)
       at Ghostscript.NET.GhostscriptDevice.Process(GhostscriptVersionInfo ghostscriptVersion, Boolean fromMemory, GhostscriptStdIO stdIO_callback)
       at CuuOnline1.PDFtoPNG.convert(String input, String output) in c:\Users\Zilvinas\Documents\Visual Studio 2013\Projects\PdfToPngConverter\PdfToPngConverter\PDFtoPNG.cs:line 51
       at CuuOnline1.PDFtoPNG.convertPDF(String input, String output) in c:\Users\Zilvinas\Documents\Visual Studio 2013\Projects\PdfToPngConverter\PdfToPngConverter\PDFtoPNG.cs:line 15
       at CuuOnline1.Program.Main(String[] args) in c:\Users\Zilvinas\Documents\Visual Studio 2013\Projects\PdfToPngConverter\PdfToPngConverter\Program.cs:line 24
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: