How can we upload the file using http post?

I am using HTTP API called HttpClient to upload the file using "post", but haven't been able to find any sample code for the same.

Any ideas? Any examples/implementations?

Edit:-

I meant HTTP API called H开发者_运维知识库ttpClient - See "Consuming RESTful Services with HttpClient" here

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You meant WebClient? Try this sample: Download And Upload A File Using C#

EDIT: Try this post: Upload file with REST