why it's not work?

Question

I do a chat project and I want to make an option to send a picture so I send the position of the picture and then when you get a position of a picture then a new picture box is created whose picture is equal to the position of the picture I received but I have an error, it's said that it is not a file location

client code:

using SimpleTcp;
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;

namespace Socil
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        SimpleTcpClient client;
        int locY;

        private void Form1_Load(object sender, EventArgs e)
        {
            client = new(txtIP.Text);
            client.Events.Connected += Events_ClientConnected;
            client.Events.DataReceived += Events_DataReceived;
            client.Events.Disconnected += Events_ClientDisconnected;

        }

        private void Events_ClientDisconnected(object sender, ClientDisconnectedEventArgs e)
        {

        }

        private void Events_DataReceived(object sender, DataReceivedEventArgs e)
        {
            this.Invoke((MethodInvoker)delegate
            {
                if (Encoding.UTF8.GetString(e.Data).Contains("C:") || Encoding.UTF8.GetString(e.Data).Contains("D:"))
                {
                    string f = Encoding.UTF8.GetString(e.Data);

                    locY += 51;
                    PictureBox tb4 = new PictureBox();
                    tb4.Location = new Point(pictureBox1.Location.X, pictureBox1.Location.Y);
                    //tb4.Text = $"fraind: {Encoding.UTF8.GetString(e.Data)} {Environment.NewLine}";
                    tb4.Size = pictureBox1.Size;
                    tb4.BackColor = pictureBox1.BackColor;
                    //string t = Encoding.UTF8.GetString(e.Data);
                    //Image myimage = new Bitmap(@f);
                    Image myimage = new Bitmap(@Encoding.UTF8.GetString(e.Data));
                    tb4.BackgroundImage = myimage;
                    Panel pe4 = new Panel();
                    pe4.Location = tb4.Location;
                    pe4.Size = new Size(tb4.Size.Width + 7, tb4.Size.Height + 6);
                    pe4.BackColor = panel1.BackColor;
                    pe4.BackgroundImageLayout = panel1.BackgroundImageLayout;
                    pe4.BackgroundImage = panel1.BackgroundImage;
                    Controls.Add(tb4);
                    Controls.Add(pe4);
                    pe4.Parent = panel4;
                    tb4.Parent = panel4;
                    pe4.BringToFront();
                    tb4.BringToFront();
                    locY += pe4.Size.Height;
                }

                if(!Encoding.UTF8.GetString(e.Data).Contains("c:") || !Encoding.UTF8.GetString(e.Data).Contains("d:"))
                {
                    locY += 51;
                    Label tb = new Label();
                    tb.Location = new Point(label5.Location.X, locY);
                    tb.Text = $"fraind: {Encoding.UTF8.GetString(e.Data)} {Environment.NewLine}";
                    tb.Size = label5.Size;
                    tb.BackColor = label5.BackColor;
                    Panel pe = new Panel();
                    pe.Location = new Point(panel5.Location.X, locY - 8);
                    pe.Size = panel5.Size;
                    pe.BackColor = panel5.BackColor;
                    pe.BackgroundImageLayout = panel5.BackgroundImageLayout;
                    pe.BackgroundImage = panel5.BackgroundImage;
                    Controls.Add(tb);
                    Controls.Add(pe);
                    pe.Parent = panel4;
                    tb.Parent = panel4;
                    pe.BringToFront();
                    tb.BringToFront();

                }



                richTextBox1.Text += Encoding.UTF8.GetString(e.Data);
            });

        }

        private void Events_ClientConnected(object sender, ClientConnectedEventArgs e)
        {

        }

        private void richTextBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                client.Connect();
                button1.Enabled = false;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "messege", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void btnSebd_Click(object sender, EventArgs e)
        {
            client.Send(txtMessege.Text);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            DialogResult result = openFileDialog1.ShowDialog();
            openFileDialog1.ShowDialog();

            if(result == DialogResult.OK)
            {
                client.Send(openFileDialog1.FileName);

            }

        }

        private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
        {
            int n = vScrollBar1.Value;
            panel4.Location = new Point(panel4.Location.X,-n);
        }

        private void button3_Click(object sender, EventArgs e)
        {

        }
    }
}

Server code:

using SimpleTcp;
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;

namespace Server
{
    public partial class Form1 : Form
    {
        IList<string> Clients = new List<string>() {};
        int h = 0;
        public Form1()
        {
            InitializeComponent();

        }

        SimpleTcpServer server;

        private void Form1_Load(object sender, EventArgs e)
        {
            server = new SimpleTcpServer(txtIP.Text);
        }


        private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
        {

        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            server.Start();
            server.Events.ClientConnected += Events_ClientConnected;
            server.Events.ClientDisconnected += Events_ClientDisconnected;
            server.Events.DataReceived += Events_DataReceived;

            btnStart.Enabled = false;
        }

        private void Events_DataReceived(object sender, DataReceivedEventArgs e)
        {
            if (h <= Clients.Count + 1)
            {
                if(Encoding.UTF8.GetString(e.Data).Contains("c:") || Encoding.UTF8.GetString(e.Data).Contains("d:"))
                {
                    for (int i = 0; i < Clients.Count; i++)
                    {
                        string f = Encoding.UTF8.GetString(e.Data);
                        server.Send(Clients[i], @f);
                    }
                }
                for (int i = 0; i < Clients.Count; i++)
                {
                    server.Send(Clients[i], $"{e.IpPort}: {Encoding.UTF8.GetString(e.Data)} {Environment.NewLine}");
                }


            }
            else
            {

                h = 0;
            }

            //string l = server.GetClients().ToString();
            //server.Send(l, $"{e.IpPort}: {Encoding.UTF8.GetString(e.Data)} {Environment.NewLine}");
        }

        private void Events_ClientDisconnected(object sender, ClientDisconnectedEventArgs e)
        {

        }

        private void Events_ClientConnected(object sender, ClientConnectedEventArgs e)
        {
            //lstClients.Items.Add(e.IpPort);
            Clients.Add(e.IpPort);
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
    }
}

How to fix this?