How to select an image in datagrid and displaying particular record from database in datalist?

Question

my query is i am displaying two templates name image and datalist in a datagrid. and i want that when i select a particular image then it will show particular name of that image in the datalist showing all the images.i.e the selected name will be highlighted in that datalist.on click event have some problem,it shows error something like void...............please help me