How to use 'System.IO.File.Delete' on server ASP.NET?

Question

I find a trouble/error to use System.IO.File.Delete in ASP.NET, when in the local is success, but when I try to publish and running in the server it's not working or files are not deleted.

this is my code :

string path = HttpContext.Current.Server.MapPath("~/Uploads/Photo/");
string fullPath = path + "myPhoto.jpg";
if (System.IO.File.Exists(fullPath))
{
    System.IO.File.Delete(fullPath);
}
else
{
    return Request.CreateResponse(HttpStatusCode.OK, new
    {
        status = true,
        message = "File is not exist",
        redirect = "",
        data = ""
    });
}

Please anyone help me solve this problem. Thanks.