System.Net.WebHeaderCollectionTests.WebHeaderCollectionTest.ResponseThenRequestHeaders_Add_Throws C# (CSharp) Method

        public void ResponseThenRequestHeaders_Add_Throws()
        {
            WebHeaderCollection w = new WebHeaderCollection();
            w[HttpResponseHeader.ContentLength] = "123";
            Assert.Throws<InvalidOperationException>(() => w[HttpRequestHeader.Accept] = "text/json");
        }