How can i get the url from an address bar using c#

Question

Help me please. How could I get the url from the address bar. Im using c# for this.

for example: if I type www.google.com in my address bar, then i would get "www.google.com" caption.

I have already done this to IExplorer, it was successful but i cannot get the url from Mozilla and Opera browsers. Kindly help me please. Many Thanks!