how to set Animated gif play once

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C#

i am using expression blend 4 with VS2010 C#

i am using a picturebox to display my animated gif, however, i only want the gif to play once, meaning there won't be any loop, how do i do that?

UPDATE from OP:
I am using expression blend 4 with VS2010 C#
I am using a picturebox to display my animated gif, however, I only want the gif to play once, meaning there won't be any loop, how do I do that?