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C# dll System.Reflection.TargetInvocationException error

I'm new on vs C#. I want to create dll file too use meta trader 5. my dll correct working in visual studio. But not working in meta trader.
Problem is Newtonsoft.Json packages.
Code
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
namespace Analiz
{
public class anlz
{
public static void metot()
{
var myDetails = JsonConvert.DeserializeObject<List<MyDetail>>(File.ReadAllText(#"C:\Users\Durak\AppData\Roaming\MetaQuotes\Terminal\D0E8209F77C8CF37AD8BF550E51FF075\MQL5\Files\json\deneme.json"));
}
}
public class MyDetail
{
public string emirtipi{get;set;}
public string miktar{get;set;}
public string takip{ get; set;}
}
}
Error :
enter image description here

When creating a DLL for an external program which does not support Newtonsoft.Json, you cannot build it this way.
Remove the reference to Newtonsoft.Json from your program.
Add a reference to System.Runtime.Serialization
After that you can refactor your code to:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
namespace Analiz
{
public class anlz
{
public static void metot()
{
System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(List<Test>));
List<MyDetail> myDetails = (List<Test>)serializer.ReadObject(new FileStream(#"C:\Users\Durak\AppData\Roaming\MetaQuotes\Terminal\D0E8209F77C8CF37AD8BF550E51FF075\MQL5\Files\json\deneme.json", FileMode.Open, FileAccess.Read));
}
}
public class MyDetail
{
public string emirtipi{get;set;}
public string miktar{get;set;}
public string takip{ get; set;}
}
}

AudioVideoPlayback doesn`t work at all. How to fix it?

I am new to C# and testing Microsoft.DirectX.AudioVideoPlayback library function.(using VS2019)
VS said there are no error, but nothing happened when I compiled it.
I have tested below code line by line. and found that Init() function does not work at all. I have tested other paths such as
#"C:\Users\name\Videos\sample.mp4"
"C:\Users\name\Videos\sample.mp4"
"C:\Users\name\Videos\sample.mp4"
but all of them does not work at all too.
How to fix the code and why it did`t work properly?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.DirectX.AudioVideoPlayback;
using System.IO;
namespace hello
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
Init();
}
public void Init()
{
Video v = Video.FromFile(#"C:\Users\name\Videos\sample.mp4");
v.Owner = this;
v.Size = new Size(1920, 1080);
v.Play();
}
}
}
This might be too simple question, but cannot gain any solution from other answers in this site.

ApplicationContext.Current is coming null

I found same question in stack over flow as here and tried same think but still I am receiving ApplicationContext.Current as null.
I am making the web service where I need to pull out a couple of pieces of data from an Umbraco database. I don't need any of the Umbraco views or any of that stuff. I'm new to the Umbraco Core libraries.
What I did was get a below reference to my new web service project
umbraco.dll
Umbraco.Core.dll
umbraco.DataLayer.dll
umbraco.editorControls.dll
umbraco.MacroEngines.dll
umbraco.providers.dll
Umbraco.Web.UI.dll
umbraco.XmlSerializers.dll
UmbracoExamine.dll
And the below class code where I am receiving ApplicationContext.Current as null
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Umbraco.Web.Mvc;
using umbraco.MacroEngines;
using Umbraco.Web;
using Umbraco.Web.WebApi;
using umbraco.NodeFactory;
using Umbraco.Core;
using Umbraco.Core.Models;
using Umbraco.Core.Services;
using umbraco.cms.businesslogic.media;
using umbraco.BusinessLogic;
using System.Configuration;
using log4net;
using System.Reflection;
using Umbraco.Core.Logging;
using System.Web.Optimization;
using System.Web.Http;
using System.Data.SqlClient;
using System.Data;
using System.Web.Script.Serialization;
using System.Collections;
using System.Collections.Specialized;
using System.Web.UI.WebControls;
using Stripe;
using System.Web.UI;
using System.Text.RegularExpressions;
using System.Web.Configuration;
using System.Web.Security;
using Newtonsoft.Json;
using System.Net.Mail;
using System.Text;
using System.Net;
using System.IO;
public class RegisterUserController : UmbracoApiController
{
public static string UmbracoConnectionString = ConfigurationManager.ConnectionStrings["umbracoDbDSN"].ConnectionString;
public static IMemberService memberService = ApplicationContext.Current.Services.MemberService;// Here I am getting ApplicationContext.Current as null
}
But I am calling this class I am getting ApplicationContext.Current as null.
So because of that I have Many methods in this class which works on memberService and due to this null reference they are not working. Even other methods which are not using member service are not being called.

For me, the code below seems to work.
public class TestApiController : UmbracoApiController
{
private static string _umbracoConnectionString = ConfigurationManager.ConnectionStrings["umbracoDbDSN"].ConnectionString;
private static IMemberService _memberService = global::Umbraco.Core.ApplicationContext.Current.Services.MemberService;
public int GetTest()
{
var memberCount = _memberService.Count();
return memberCount;
}
}
If the above code isn't working for you e.g. with AJAX, try the below code:
public class TestApiController : UmbracoApiController
{
public int GetTest()
{
var ms = Services.MemberService;
return ms.Count();
}
}

Custom Class Inside a WCF Service Object

A bit rusty here with regards to WCF Services.
I have a custom class named cSecurity.cs which does some custom functions.
I want to use this custom class inside my Service:
This is the App.svc.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace AppServices
{
public class App : IApp
{
public cSecurity _csec;
public string GetItems(int agentID, string agentName)
{
// Need to use some functions from the cSecurity class here???
return _csec.getItems();
}
}
}
This is the cSecurity.cs class:
using System.Collections;
using System.Configuration;
using System.Net;
namespace AppServices
{
public class cSecurity
{
// Some functions defined here....
public string getItems(){
return string.Empty;
}
}
}
But I am getting an error on the line:
public cSecurity _csec;
"The type or namespace name 'cSecurity' could not be found."
This seems pretty trivial but I seem to be lost here.
Appreciate any insight. Thanks.

For some reason, the solution for this was for me to close and restart VS. Not sure what caused the class for it to be not referenced by VS.

How to make port forwarding with UPNPNATClass

I' trying to do port forwarding. I've done following:
NATUPNPLib.dll was added to references
NATUPNPLib was added to using section of page
Following codes were written
But a null reference exception thrown
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Net.Sockets;
using System.Net;
using NATUPNPLib;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
UPnPNATClass upnpnat = new UPnPNATClass();
IStaticPortMappingCollection mappings = upnpnat.StaticPortMappingCollection;
foreach (IStaticPortMapping map in mappings)
{
Console.WriteLine(map.ExternalIPAddress);
}
Console.ReadKey();
}
}
}
How can I overcome this problem?