Reduse image height/width without saving to hard disk

Hi,
if you are uploading the image with flie type control,and you want to reduce image size without saving the original image on the hard disk,THen you can do it like the following (this is all code behind part) :
on the button click write the code:
protected void btnSubmit_Click(object sender, EventArgs e)
{
Stream s = Request.Files["id of the file control"].InputStream;
Size size = new Size(); // size class is included in using //System.Drawing.Imaging; namespace
size = GetBigDimensions();
size = GetBigDimensions();
System.Drawing.Bitmap img = (Bitmap)System.Drawing.Bitmap.FromStream(s);
if (img.Width != size.Width || img.Height != size.Height )
{
img = (System.Drawing.Bitmap)GetThumb(new Bitmap(img), size.Width, size.Height, true, Color.White);
}
SaveImage(img, Server.MapPath("~/path of the folder where you want to store the image" + imagename variable));
}

public Size GetBigDimensions()
{
Size s = new Size(302, 204);// you can set height and width what you want
return s;
}
public Image GetThumb(Image _image, int w, int h, bool HiQuality, Color bgColor)
{
if (_image == null)
return null;

Bitmap bmp = new Bitmap(w, h);
Image img = (Image)bmp;
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage((Image)img);
g.Clear(bgColor);


if (_image.Width > w
|| _image.Height > h)
{
if (HiQuality)
{
g.CompositingQuality = CompositingQuality.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
}
else
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Low;

double ratio = Math.Min(1 / ((double)_image.Width / w), 1 / ((double)_image.Height / h));
float posX = (w / 2 - (_image.Width * (float)ratio) / 2);
float posY = (h / 2 - (_image.Height * (float)ratio) / 2);
g.DrawImage(_image, posX, posY, (float)_image.Width * (float)ratio, (float)_image.Height * (float)ratio);
}
else
{
int posX2 = (int)(((double)w / 2.0) - ((double)_image.Width / 2.0));
int posY2 = (int)(((double)h / 2.0) - ((double)_image.Height / 2.0));



g.DrawImage(_image, posX2, posY2, _image.Width, _image.Height);
}

g = null;
return img;
}
public void SaveImage(System.Drawing.Image img, string path)
{
string Format = path.Substring(path.IndexOf(".") + 1);
switch (Format.ToLower())
{
case "gif":
case "jpg":
{
EncoderParameters eps = new EncoderParameters(1);
eps.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 90L);
ImageCodecInfo ici = GetEncoderInfo("image/jpeg");
img.Save(path, ici, eps);
} break;
default:
img.Save(path);
break;
}

}

private static ImageCodecInfo GetEncoderInfo(String mimeType)
{
int j;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == mimeType)
return encoders[j];
} return null;
}

and you are done with it ,Its that easy.Using the above we can also reduce of image shriking.