IMAGES IN ASP.NET GRIDVIEW IN THUMBNAIL FORMAT

Have two sets of the images: of original full size and resampled down to a thumbnail size. Keep them on your server side as files. Create a function which finds a file name in one set by a file name in another set. One simplest way to implement it would be using special naming schema: say, "MyFile.png" (full size) could have its thumbnail counterpart names, say ""MyFile.thumbnail.png", so the function will be just adding or removing ".thumbnail" suffix. On click, locate the thumbnail file name, calculate the full-size file name out of it, show it the way you want.

This is one of the simplest ways. You can design something more sophisticated, especially if you expect your work to grow in features or need extra flexibility by whatever reason.

Any further questions? How to show? Anything else?

—SA