opencv on visual studio 2017

I m new in opencv and I try to run the following code on my visual studio 2017

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net;
using System.Net.Sockets;



using System.Runtime.InteropServices;

using OpenCvSharp;




namespace CVSharp
{



public partial class Form1 : Form
{
    Thread thread;

    //CvCapture camera;
    CvMemStorage storage = new CvMemStorage();

    const int WIDTH = 1920/4; //3840/8; //960; //1920; //320; //640;
    const int HEIGHT = 1080/4; //2748/8; //687; //1080; //240; //480;
    const int PIX_P_FRAME = 480;
    const int BYTES_P_PIX = 3;
    const int BYTES_P_FRAME = PIX_P_FRAME * BYTES_P_PIX;


    volatile bool running = true;

    public Form1()
    {
        InitializeComponent();

        thread = new Thread(new ThreadStart(CameraLoop));
        thread.Start();
    }


    int ClickX = -1;
    int ClickY = -1;


    public void CameraLoop()
    {




        IplImage image = new IplImage(new CvSize(WIDTH, HEIGHT), BitDepth.U8, BYTES_P_PIX);
        image.Set(new CvScalar(255, 255, 255, 255));
        //image.Flip(null, 0);
        IplImage image2 = new IplImage(new CvSize(WIDTH, HEIGHT), BitDepth.U8, 1);
        image2.Set(new CvScalar(255));

        IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 18004);

        //udp
        UdpClient newsock = new UdpClient(ipep);
        Console.WriteLine("Waiting for a client...");
        IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);

        //tcp
        //Socket newsock = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
        //newsock.Bind(ipep);
        //newsock.Listen(10);
        //Console.WriteLine("Waiting for a client...");
        //Socket client = newsock.Accept();
        //IPEndPoint clientep =
        //             (IPEndPoint)client.RemoteEndPoint;
        //Console.WriteLine("Connected with {0} at port {1}",
        //                clientep.Address, clientep.Port);

        //byte[] data = new byte[8 + BYTES_P_PIX * PIX_P_FRAME];






        while (running)
        {

            UdpFrame frame = UdpFrame.Deserialize(newsock.Receive(ref sender));
            //client.Receive(data);
            //UdpFrame frame = UdpFrame.Deserialize(data);
            //Int64 Offset = frame.SeqNo * BYTES_P_FRAME;
            Int64 Offset = WIDTH*HEIGHT*BYTES_P_PIX - (frame.SeqNo+1) * BYTES_P_FRAME; //flip and mirror
            //Int64 Offset = 
            //Console.WriteLine("SeqNo: {0}",frame.SeqNo);
            //if (frame.CamNo == 2)
            //{
            //    Marshal.Copy(frame.Data, 0, new IntPtr(image2.ImageData.ToInt64() + Offset), frame.Data.Length);
            //    //if(frame.CamNo == 2)
            //    //    if (frame.SeqNo == 0)
            //    //        Console.WriteLine("gray new frame");
            //}
            //else 
            //{
            //    Marshal.Copy(frame.Data, 0, new IntPtr(image.ImageData.ToInt64() + Offset), frame.Data.Length);
            //}
            Marshal.Copy(frame.Data, 0, new IntPtr(image.ImageData.ToInt64() + Offset), frame.Data.Length);

            //if (frame.SeqNo == 0)
            //    Console.WriteLine(frame.CamNo);

            if (frame.SeqNo == 0)
            {
                this.Invoke((MethodInvoker)delegate
                {
                    //image.Flip(null, 0);
                    //image.Flip();
                    Bitmap Image;
                    if (frame.CamNo == 2)
                        Image = image2.ToBitmap();
                    else
                        Image = image.ToBitmap();
         //           Image.RotateFlip(RotateFlipType.Rotate180FlipY);
                    pictureBox1.Image = Image;
                 //   image = new IplImage(new CvSize(640, 480), BitDepth.U8, 4);
                 //   GC.Collect();

                });
            }

        }
        image.Dispose();
        image2.Dispose();
        GC.Collect();
    }

    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        running = false;
        Thread.Sleep(1000);
        thread.Abort();

    }

    private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
    {
        ClickX = e.X;
        ClickY = e.Y;
    }



    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public struct UdpFrame
    {
        public UInt32 CamNo;
        public UInt32 SeqNo;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = BYTES_P_FRAME)]
        public Byte[] Data;


        public static UdpFrame Deserialize(Byte[] data, int offset = 0)
        {
            int objsize = Marshal.SizeOf(typeof(UdpFrame));
            IntPtr buff = Marshal.AllocHGlobal(objsize);
            Marshal.Copy(data, offset, buff, objsize);
            UdpFrame retStruct = (UdpFrame)Marshal.PtrToStructure(buff, typeof(UdpFrame));
            Marshal.FreeHGlobal(buff);
            return retStruct;
        }
    }

    private void pictureBox1_Click(object sender, EventArgs e)
    {

    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }
}
 }

but it is stopped on following line

    CvMemStorage storage = new CvMemStorage();

and display this message

An exception has accured because of P/Invoke. please check the following: 1.OpenCV's DLL files exist in the same directory as the executable file. 2.visual C++ Redistributable Package has been installed. 3.The target platform(x86/x64) of OpenCV's DLL files and OpenCvSharp is the same as your project's. System.DllNotFoundException:Unable to load DLL 'opencv_core231': The specified module could not be found.(Exception from HRESULT:0x8007007e) at OpenCvSharp.CvInvoke.cvReleaseImage(IntPtr& image) at OpenCvSharp.Utilities.PInvokeHelper.TryPInvoke()

while the opencv_core231 dll is exists, how can I solve this problem note that I have installed opencv231 and it works by .net framework version=2.0 thank you