A Generic error occurred in GDI in Bitmap Save method

Question

I am trying to copy a thumbnail of an image to the thumbnail folder But when I do this I have this error: "A generic error occurred in GDI+". I followed this link to do that: http://weblogs.asp.net/markmcdonnell/archive/2008/03/09/resize-image-before-uploading-to-server.aspx.

Code:

    protected void ResizeAndSave(PropBannerImage objPropBannerImage)

    {

        // Create a bitmap of the content of the fileUpload control in memory

        Bitmap originalBMP = new Bitmap(fuImage.FileContent);


        // Calculate the new image dimensions

        int origWidth = originalBMP.Width;

        int origHeight = originalBMP.Height;

        int sngRatio = origWidth / origHeight;

        int thumbWidth = 100;

        int thumbHeight = thumbWidth / sngRatio;


        int bannerWidth = 100;

        int bannerHeight = bannerWidth / sngRatio;


        // Create a new bitmap which will hold the previous resized bitmap

        Bitmap thumbBMP = new Bitmap(originalBMP, thumbWidth, thumbHeight);

        Bitmap bannerBMP = new Bitmap(originalBMP, bannerWidth, bannerHeight);


        // Create a graphic based on the new bitmap

        Graphics oGraphics = Graphics.FromImage(thumbBMP);

        // Set the properties for the new graphic file

        oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;


        // Draw the new graphic based on the resized bitmap

        oGraphics.DrawImage(originalBMP, 0, 0, thumbWidth, thumbHeight);


        Bitmap newBitmap = new Bitmap(thumbBMP);

        thumbBMP.Dispose();

        thumbBMP = null;


        // Save the new graphic file to the server

        newBitmap.Save("~/image/thumbs/" + "t" + objPropBannerImage.ImageId, ImageFormat.Jpeg);


        oGraphics = Graphics.FromImage(bannerBMP);

        // Set the properties for the new graphic file

        oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;


        // Draw the new graphic based on the resized bitmap

        oGraphics.DrawImage(originalBMP, 0, 0, bannerWidth, bannerHeight);

        // Save the new graphic file to the server

        bannerBMP.Save("~/image/" + objPropBannerImage.ImageId + ".jpg");



        // Once finished with the bitmap objects, we deallocate them.

        originalBMP.Dispose();


        bannerBMP.Dispose();

        oGraphics.Dispose();

    }

Can someone help me solve this?