Post and Put methods input params always null

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C#

.NET

MVC

WebAPI

Hi,

I have multiple WebApi controllers in my project all other controller is working fine except one for which the Post and Put method receive the input model param as null always.

Below is the code snippet-

// POST api/Post
public HttpResponseMessage PostPostRepository(PostRepository postrepository)
{
  ....


}

Is this because of the model name that I used ?
Any pointers to this will be appreciable.

Thanks