ASP.NET Image uploading with Resizing

Question

I have an aspx page which will upload images to server harddisk from client pc

But now i need to change my program in such a way that it would allow me to resize the

Answer 1

You can use this, it does a dandy job for me. But it does not handle low res images well for me. Thankfully I down use to many of them. Just sent it the image byte[] and the expected output and you'll be good to go.

public static byte[] ResizeImageFile(byte[] imageFile, int targetSize) 
{ 
    using (System.Drawing.Image oldImage = System.Drawing.Image.FromStream(new MemoryStream(imageFile))) 
    { 
        Size newSize = CalculateDimensions(oldImage.Size, targetSize); 

        using (Bitmap newImage = new Bitmap(newSize.Width, newSize.Height, PixelFormat.Format32bppRgb)) 
        { 
            newImage.SetResolution(oldImage.HorizontalResolution, oldImage.VerticalResolution); 
            using (Graphics canvas = Graphics.FromImage(newImage)) 
            { 
                canvas.SmoothingMode = SmoothingMode.AntiAlias; 
                canvas.InterpolationMode = InterpolationMode.HighQualityBicubic; 
                canvas.PixelOffsetMode = PixelOffsetMode.HighQuality; 
                canvas.DrawImage(oldImage, new Rectangle(new Point(0, 0), newSize)); 
                MemoryStream m = new MemoryStream(); 
                newImage.Save(m, ImageFormat.Jpeg); 
                return m.GetBuffer(); 
            } 
        } 

    } 
} 

private static Size CalculateDimensions(Size oldSize, int targetSize) 
{ 
    Size newSize = new Size(); 
    if (oldSize.Width > oldSize.Height) 
    { 
        newSize.Width = targetSize; 
        newSize.Height = (int)(oldSize.Height * (float)targetSize / (float)oldSize.Width); 
    } 
    else 
    { 
        newSize.Width = (int)(oldSize.Width * (float)targetSize / (float)oldSize.Height); 
        newSize.Height = targetSize; 
    } 
    return newSize; 
}