Getting Data from previous page

Question

Hi dudes

can any one help me i am trying to get data from listbox previous page and it is not retrived and i am trying in this way... can any one help me..

ListBox  l = (ListBox)PreviousPage.FindControl("ListBox1");

        foreach (ListItem list in l)

        {

            if (list.Selected)

            {

                Response.Write(list.Text);

            }

        }