title: How to update record in windows phone 8
body: <p>I am developing windows phone 8 app.
  I am having textbox and buttons and image in listbox.
  When I added data to above columns then on click on button I am saving data in windows azure.
  This is working fine.
  when I click on image I am geting its index and all values related to it.
  Now i can change these values if wants. and when click on button update query should get fire for selectes index.
  How to find update query for selected index in WINDOWS PHONE 8
  when click on button I want to fire update queryfor updating values of textbox in windows azure database.</p>