A generic error occurred in GDI+ when savin image in stream

Question

Here is the thing I try to achieve:

• Upload png image to server
• Save it;
• Load the saved image, generate thumbnail;
• Save it in different location;

Everything is fine until I have to save the thumbnail. At first I thought that it is the folder permissions or something, so to verify I tried to save it in a MemmoryStream and again I get this "generic GDI+ error", no InnerException or some descriptive StackTrace. I was thinking that there is something to do with disposing the original Bitmap but still the same. Here is the code:

postedFile.SaveAs(fullFilePath);
FileStream fs = new FileStream(fullFilePath, FileMode.Open);
Image image = Bitmap.FromStream(fs);

Image thumb = image.GetThumbnailImage(thumbsWidth, thumbsHeight, AbortThumbnailPicture, IntPtr.Zero);
image.Dispose();
fs.Dispose();
using (MemoryStream ms = new MemoryStream())
{
    thumb.Save(ms, ImageFormat.Png); //*** HERE THROWS THE EXCEPTION ***

    using (FileStream fstream = new FileStream(fullThumbsPath, FileMode.Create, FileAccess.Write))
    {
        ms.WriteTo(fstream);
        fstream.Close();
    }
    ms.Close();
}

// The GetThumbnailImage callback
private bool AbortThumbnailPicture()
{
    return true;
}

I don't know what else to do please help.

Answer 1

Thank all of you that commented on my question, your comments lead me to the right problem.

So this line of code is just wrong: Image thumb = image.GetThumbnailImage(thumbsWidth, thumbsHeight, AbortThumbnailPicture, IntPtr.Zero);

Now I'm using more standardized code that gets the job done very well, here it is:

public static Image ResizeImage(Image image, Size size, bool preserveAspectRatio = true)
    {
        int newWidth;
        int newHeight;
        if (preserveAspectRatio)
        {
            var originalWidth = image.Width;
            var originalHeight = image.Height;
            var percentWidth = size.Width / (float)originalWidth;
            var percentHeight = size.Height / (float)originalHeight;
            var percent = percentHeight < percentWidth ? percentHeight : percentWidth;
            newWidth = (int)(originalWidth * percent);
            newHeight = (int)(originalHeight * percent);
        }
        else
        {
            newWidth = size.Width;
            newHeight = size.Height;
        }
        Image newImage = new Bitmap(newWidth, newHeight);
        using (var graphicsHandle = Graphics.FromImage(newImage))
        {
            graphicsHandle.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphicsHandle.SmoothingMode = SmoothingMode.HighQuality;
            graphicsHandle.PixelOffsetMode = PixelOffsetMode.HighQuality;
            graphicsHandle.DrawImage(image, 0, 0, newWidth, newHeight);
        }
        return newImage;
    }