I just find that the problem is not related to the webmethod.

It is caused by another problem.

I set the Session["PhotoId"] in a normal aspx. But I can't retrieve value in the webMethod of the aspx page.

[WebMethod(EnableSession=true)]
    public static string Submit(string data1, ...)
    {
        string test = HttpContext.Current.Session["PhotoId"]; // test is null
    }

What should I do?

asp.net
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