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Asked: 2026-05-21T08:47:49+00:00

We use ASP.Net 4.0. In our code we regularly use Response.AddHeader(x, y) . Is

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We use ASP.Net 4.0. In our code we regularly use Response.AddHeader("x", "y"). Is this exactly the same as Response.AppendHeader("x", "y")? I read that AppendHeader only exists for compatibility with classic ASP, which we do not use.

Can we, without any concerns, replace AddHeader with AppendHeader?

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  1. Editorial Team

    They are the same, so yes, you can replace HttpResponse.AddHeader with HttpResponse.AppendHeader.

    From MSDN

    AddHeader is the same as AppendHeader
    and is provided only for compatibility
    with earlier versions of ASP. With
    ASP.NET, use AppendHeader.

    A quick peek with Reflector confirms that HttpResponse.AddHeader just calls HttpResponse.AppendHeader.

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