How resize image when upload in asp.net 4.0 ?

protected void UploadFile(Object s, EventArgs e)
{
    // First we check to see if the user has selected a file
    if (fileUpload.HasFile)
    {
        // Find the fileUpload control
        string filename = fileUpload.FileName;

        // Check if the directory we want the image uploaded to actually exists or not
        if (!Directory.Exists(MapPath(@"Uploaded-Files")))
        {
             // If it doesn't then we just create it before going any further
             Directory.CreateDirectory(MapPath(@"Uploaded-Files"));
        }

        // Specify the upload directory
        string directory = Server.MapPath(@"Uploaded-Files\");

        // Create a bitmap of the content of the fileUpload control in memory
        Bitmap originalBMP = new Bitmap(fileUpload.FileContent);

        // Calculate the new image dimensions
        int origWidth = originalBMP.Width;
        int origHeight = originalBMP.Height;
        int sngRatio = origWidth / origHeight;
        int newWidth = 100;
        int newHeight = newWidth / sngRatio;

        // Create a new bitmap which will hold the previous resized bitmap
        Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight);
        // Create a graphic based on the new bitmap
        Graphics oGraphics = Graphics.FromImage(newBMP);

        // 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, newWidth, newHeight);

        // Save the new graphic file to the server
        newBMP.Save(directory + "tn_" + filename);

        // Once finished with the bitmap objects, we deallocate them.
        originalBMP.Dispose();
        newBMP.Dispose();
        oGraphics.Dispose();

        // Write a message to inform the user all is OK
        label.Text = "File Name: <b style='color: red;'>" + filename + "</b><br>";
        label.Text += "Content Type: <b style='color: red;'>" + fileUpload.PostedFile.ContentType + "</b><br>";
        label.Text += "File Size: <b style='color: red;'>" + fileUpload.PostedFile.ContentLength.ToString() + "</b>";
        // Display the image to the user
        Image1.Visible = true;
        Image1.ImageUrl = @"/Uploaded-Files/tn_" + filename;
    }
    else
    {
         label.Text = "No file uploaded!";
    }
}

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