C# windows 7 save picture without showing save file dialog

hello guys
i am try to save picture without using file dialog
duing i compile my code at my computer, windows 7
the picture is save without showing file dialog

but after i install my aplication on other computer, windows 7
it keep showing file dialog.
can i know how to remove that file dialog?

What I have tried:

_pathLoc = "C:\\bookbar\\Book Borrowed Record\\Form " + formNumber + "\\" + formName ;

if (!Directory.Exists(_pathLoc)) {
// create path location if the path string doesn't exist
Directory.CreateDirectory(_pathLoc);
}

_imagePath = _pathLoc + "\\" +studentName + ".jpeg";

// create image of list of barcode already created
           var bmp = new Bitmap(Width, Height, CreateGraphics());
           DrawToBitmap(bmp, new Rectangle(0, 0, Width, Height));
           e.Graphics.DrawImage(bmp, 0, 0);

           // save the image
           bmp.Save(@_imagePath, System.Drawing.Imaging.ImageFormat.Jpeg);

Tags: C#