Friday, February 13, 2009

Generate Thumbnail Image View on Fly

One of the common requirement for almost every commercial web application is how to generate thumbnail view of image on fly.

Example: Generate thumbnail view of product image on fly, if product image is not available in ProductThumbnail Folder and if thumbnail view is already available simply display it rather than generating new thumbnail view.

//Take Original Image Path and Returns Thumbnail Image Path.
private string GetThumbnailView(string originalImagePath,int height,int width)
//Consider Image is stored at path like "ProductImage\\Product1.jpg"

//Now we have created one another folder ProductThumbnail to store thumbnail image of product.
//So let name of image be same, just change the FolderName while storing image.
string thumbnailImagePath = originalImagePath.Replace("ProductImage", "ProductThumbnail");
//If thumbnail Image is not available, generate it.
if (!System.IO.File.Exists(Server.MapPath(thumbnailImagePath)))
System.Drawing.Image imThumbnailImage;
System.Drawing.Image OriginalImage = System.Drawing.Image.FromFile(Server.MapPath(originalImagePath));
imThumbnailImage = OriginalImage.GetThumbnailImage(width, height,
new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);

return thumbnailImagePath;

public bool ThumbnailCallback() { return false; }

Code to Call Function


Reason for Generating Thumbnail: You can display image by simply changing its height and width property, but generating a thumbnail view will decrease page size, therefore transfer of data between server and client, thus pagesize would be light weight and can be load much faster. Summarizing few advantage are Bandwidth Saving, Fast loading (Improved Performance), SEO Friendly, etc.

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