alphabit -wise

Question

hai 2 all


i had an girdview say products
at the above gridview i hv to do like this

products name wise: A B C D ........X Y Z

when ever we click on name ...the gridview has to show only the productsnames which start from that alphabit
for example if i click on A
then in gridview i hav to see only the product names whose productnames starts with a letter A