C# how to see image after clicking on button in metrogrid or datagridview

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C#

WinForms

SQL-Server-2014

I have register form,where Users can fill their datas`Name,Surname and so on, and can upload image from computer.After uploading image, when i click on button Register,that user's datas saving in database.Then i have another form where i can see all registered users in metroGrid,but only their Name,Surname,Date,Country and i also have Details button in metroGrid.when i click on Details button,opens another form where i can see user's all data` the image too.Everything is okay,i can see all datas except Image, it gives me error.What's the problem?

This is Register form[^]
This is User's form[^]
This is the form,where i can see user's all datas,and Exception[^]
This is Users table in Database[^]

What I have tried:

 //Upload button click
 private void bunifuImageButton6_Click(object sender, EventArgs e)
        {
            this.op = new OpenFileDialog();
            if (op.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image = new Bitmap(op.FileName);
            }
            this.n = Path.GetFileName(op.SafeFileName);
        }
//Register button click
            string a = textBox1.Text;
            string b = textBox2.Text;
            string c = textBox3.Text;
            string d = textBox4.Text;
            string f = textBox5.Text;
            n = pictureBox1.Image.ToString();
            DateTime g = dateTimePicker1.Value;
                using (var context = new Suren_BankEntities())
                {
                    User user = new User()
                    {
                        Name = a,
                        Surname = b,
                        Country = c,
                        Login = d,
                        Password = f,
                        Date = g,
                        Photo = n,
                    };
               }
//MetroGrid's CellContentClick
 private void metroGrid1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            int index = metroGrid1.CurrentCell.RowIndex;
            int id = (int)metroGrid1.Rows[index].Cells["Id"].Value;
            if (metroGrid1.Columns[e.ColumnIndex].Name == "Details")
            {
                    UserDatas u = new UserDatas(id);
                    u.Show();
            }
        }

private void UserDatas_Load(object sender, EventArgs e)
        {
            using (var context = new Suren_BankEntities())
            {
                User founded = context.Users.Find(id);
                label20.Text = founded.Name;
                label19.Text = founded.Surname;
                label18.Text = founded.Date.ToString();
                label17.Text = founded.Country;
                label16.Text = founded.CardNumber.ToString();
                label15.Text = founded.Login;
                label14.Text = founded.Password;
                label13.Text = founded.AMD.ToString();
                label12.Text = founded.RUR.ToString();
                label11.Text = founded.USD.ToString();
                pictureBox1.Image = new Bitmap(founded.Photo);
            }
        }