How do I use ghostscript to convert PDF to tif

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C#

ASP.NET5

ghostscript

I tried to convert PDF to tif images using ImageMagick it works but it is very slow with large files. Now I tried to use ghostscript, it works fine from power-shell but it is not executing with c# asp.vet VS19.
Here is the command that works:

gswin64c.exe -dNOPAUSE -r300 -sDEVICE=tiffscaled24 -sCompression=lzw -dBATCH -sOutputFile="C:\Users\name\Desktop\images\Result\ %d.tif" "C:\Users\name\Desktop\images\DropHere\New folder\name.pdf" 

you need ghostscript exe and intallatipm folder to run this.
But my c# doesn't work. No error or anything it just go through the method step by step nothing happens.

What I have tried:

  public void ExtracImagesFromPdf(string fileName, string fileNameResultDirectory)
        {
string ghostScriptPath = @"C:\Program Files\gs\gs9.50\bin\gswin64.exe";
            String ars = " - dNOPAUSE -sDEVICE=jpeg -r102.4 -o" + "C:\\Users\\syousif\\Desktop\\images" + "%d.jpg -sPAPERSIZE=a4 " + fileNameResultDirectory;
            Process proc = new Process();
            proc.StartInfo.FileName = ghostScriptPath;
            proc.StartInfo.Arguments = ars;
            proc.StartInfo.CreateNoWindow = true;
            proc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            proc.Start();
            proc.WaitForExit();
}

OR

//  System.Environment.CurrentDirectory = @"C:\Program Files\gs\gs9.50\bin\";

           // String ars = "-dNOPAUSE -r300 -sDEVICE=tiffscaled24 -sCompression=lzw -dBATCH -sOutputFile=\"" + fileNameResultDirectory + "\" -%d.tif \"" + fileName + "\"";
           // string line = ".\\c:\\gswin64c.exe " + ars;

           //var  res = System.Diagnostics.Process.Start("gswin64c.exe", ars);

I also tried this way:

 public void ExtracImagesFromPdf(string fileName, string inputpath)
        {
GhostscriptPngDevice img = new GhostscriptPngDevice(GhostscriptPngDeviceType.Png16m);
            img.GraphicsAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
            img.TextAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
            img.ResolutionXY = new GhostscriptImageDeviceResolution(200, 200);
            img.InputFiles.Add(inputpath); 
            //img.Pdf.FirstPage = 1; 
            //img.Pdf.LastPage = 1;
            img.PostScript = string.Empty;
            img.OutputPath = @"C:\Users\name\Desktop\images\Result";
            img.Process();
}

But I get this error:

An error occured when call to 'gsapi_init_with_args' is made: -100 at the last line