split last section of a string in c#

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i have a kind of input in my program witch users type a link like "http://ift.tt/RTHYiv" and i looking for a code to give me the last section of the link (sample.png)

More accurate:

user type this in a textbox : "http://ift.tt/RTHYiv"

and i receive this : string a = "sample.png"

in other hand i want know all elements after last "/" in my program. i think we can use split() or trim() but i don't know how!

asked 50 secs ago

Amir mohammad Nasrollahi

8