RemoteFlowSource.cs

using System;
using System.Collections.Specialized;

namespace System.ServiceModel
{
    public sealed class ServiceContractAttribute : Attribute { }
    public sealed class OperationContractAttribute : Attribute { }
}

namespace RemoteFlowSource
{
    using System.ServiceModel;
    using System.Runtime.Serialization;
    using System.Collections.Generic;

    [DataContract]
    public class SampleData { }

    [ServiceContract]
    public interface ISampleService
    {
        [OperationContract]
        string Operation(SampleData sampleData, string taint);
    }

    public class RemoteFlowSource : ISampleService
    {
        public static void M(System.Web.HttpRequest request, System.Web.UI.WebControls.TextBox textBox)
        {
            Use(request);
            Use(textBox);
        }

        public string Operation(SampleData sampleData, string taint) => sampleData + taint;

        public static void Use(Object o) { }

        public static void M2(System.Net.HttpListenerRequest request)
        {
            Use(request);
        }

        public static void M2(System.Web.HttpRequestBase request)
        {
            Use(request.Unvalidated.RawUrl);
        }

        public static async void M3(System.Net.WebSockets.WebSocket webSocket)
        {
            var buffer = new byte[1024];
            var segment = new ArraySegment<byte>(buffer);
            var result = await webSocket.ReceiveAsync(segment, System.Threading.CancellationToken.None);
            Use(segment);
        }
    }
}

namespace AspRemoteFlowSource
{
    using System.Web.Services;

    public class MySubData
    {
        public string SubDataProp { get; set; }
    }

    public class MyElementSubData
    {
        public string ElementSubDataProp { get; set; }
    }

    public class MyData
    {
        public string DataField;
        public string DataProp { get; set; }
        public MySubData SubData { get; set; }
        public MyElementSubData[] Elements { get; set; }
    }

    public class MyDataElement
    {
        public string Prop { get; set; }
    }


    public class MyService
    {
        [WebMethod]
        public void MyMethod(MyData data)
        {
            Use(data.DataProp);
            Use(data.SubData.SubDataProp);
            Use(data.Elements[0].ElementSubDataProp);
        }

        [WebMethod]
        public void MyMethod2(MyDataElement[] data)
        {
            Use(data[0].Prop);
        }

        public static void Use(object o) { }
    }
}