Asp.net c# Upload Images keeping its aspect ratio

Question

Hi all,

I'm new with asp.net c#. Having difficulties in thumbnail fixed size for the resize image.

Below is a example that I want to accomplish. Example #2.

http://www.codeproject.com/Articles/2941/Resizing-a-Photographic-image-with-GDI-for-NET

I did resize the image but only fixed the height to 300. I also need a fixed size thumbnail like the example #2 with color padding.

Below is my code in asp.net c#:

<%@ Import Namespace="System.Data" %>

<%@ Import Namespace="System.Data.OleDb" %>

<%@ Import Namespace="System.Web.UI.WebControls" %>

<%@ Import Namespace="System.Data.SqlClient" %>

<%@ Import Namespace="System.Drawing" %>

<%@ Import Namespace="System.Drawing.Imaging" %>

<%@ Import Namespace="System.Drawing.Drawing2D" %>

protected void btnUpload_Click(object sender, EventArgs e)

{

if (FileUpload1.PostedFile != null)

{

string fileExt = System.IO.Path.GetExtension(FileUpload1.FileName);

if (fileExt == ".jpeg" || fileExt == ".jpg" || fileExt == ".png")

{

string FileName = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);

string FilePath = Server.MapPath("~/CampaignImages/original/" + FileName);

string resizedImage = Server.MapPath("~/CampaignImages/thumb/" + FileName);

//Save files to disk

FileUpload1.SaveAs(FilePath);

Bitmap originalBMP = new Bitmap(FileUpload1.FileContent); 

// Calculate the new image dimensions

int thumbnailSize = 300;

int newWidth, newHeight;

if (originalBMP.Width < originalBMP.Height)

 {

 newWidth = originalBMP.Width * thumbnailSize / originalBMP.Height;

 newHeight = thumbnailSize;

 }

else

 {

 newWidth = thumbnailSize;

 newHeight = originalBMP.Height * thumbnailSize / originalBMP.Width;

 }  

  

// 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);   

oGraphics.Clear(Color.Red);            

// 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(resizedImage + FileName ); 

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

originalBMP.Dispose(); 

newBMP.Dispose();

oGraphics.Dispose();

else 

  { 

 LabelError.Text = "File must be in .JPG or .PNG format."; 

  } 

  } 

 }

Any help would be appreciate.

Regards,

Joseph