click on a datalist image and display in a new window

Question

i have a datalist which received images from the database. and i am also storing image in a image folder on the project.  images are perfectly loaded in datalist. but when i click that image it is  automatically redirected to the default.aspx page. i want when i click any image in datalist then the image should display in a another window.
how to do that?
 can anyone give me code in asp.net,C#.