I need to get the current location using maps (GPS) when the user clicks the button () in my application......NEED URGENT

Question

  hi,

     i want to get the current location of the user (like in GPS we get current location).

     i created a button (ok)  when the user clicks on ok button i need to read the current location of the user.

    can some one help me in providing the code for my problem 

   i was planning to use bing maps. to get the current location.


  example....

   if the user is  MG road in Hyderabad, i need to get the current location of the user (i.e. MG road) when the user clicks ok button in my application.
   

   if the user changes the location, when the user clicks the button again i need to get the new current location (for example user is in majestic)