How to move items between ListBoxes in ASP.NET

Question

Hi All,

In my ASP.NET webform I created two ListBoxes at run time when Page loads and they take the data from two files in local drive. (Every thing is working fine till here)

Iam having a lot of trouble here.

I have Add and Remove buttons in between these two ListBoxes. The user can select items in one ListBox and using the buttons, swap them around.

How can I achieve this one, Can I do it by using server side script or by using client side script .

After swap, when user clicks on Finish Button, it should save the file in local drive.

Advance thanks,

Darma