Charger l'image de Base de données SQL

J'ai cherché des solutions mais ne sais pas où je suis de faire le mal. Mais je le fais pour la première fois.

J'ai une classe d'Étudiants

class Students
{
public Image photo { get; set; }
public bool AddStudent(Students _student)
{
Settings mySettings = new Settings();
SqlCeConnection conn = new SqlCeConnection(mySettings.StudentsConnectionString);
SqlCeCommand cmd = new SqlCeCommand();
cmd.CommandType = System.Data.CommandType.Text;
cmd.Connection = conn;
cmd.CommandText = "insert into students (firstname, lastname, dob, allergic, allergydetails, memo, address, photo) " +
"Values (" +
"'" + @FirstName + "'," +
"'" + @LastName + "'," +
"'" + @Dob + "'," +
"'" + @isAllergic + "'," +
"'" + @AllergyDetails + "'," +
"'" + @Memo + "'," +
"'" + @photo + "'," +
"'" + @Address + "')";
cmd.Parameters.Add("@FirstName", _student.FirstName);
cmd.Parameters.Add("@LastName", _student.LastName);
cmd.Parameters.Add("@Dob", _student.Dob);
cmd.Parameters.Add("@isAllergic", _student.isAllergic);
cmd.Parameters.Add("@AllergyDetails", _student.AllergyDetails);
cmd.Parameters.Add("@Memo", _student.Memo);
cmd.Parameters.Add("@photo", _student.photo);
cmd.Parameters.Add("@Address", _student.Address);
try
{
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
return true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString());
return false;
}
finally
{
if (conn.State == System.Data.ConnectionState.Open) conn.Close();
cmd = null;
}
}  

Maintenant je passe les valeurs de propriété à partir de mon formulaire, comme ceci.

  private void btnAdd_Click(object sender, EventArgs e)
{
Students myStudent = new Students();
myStudent.FirstName = txtFirstName.Text.Trim();
myStudent.LastName = txtLastName.Text.Trim();
myStudent.Dob = dtPicker1.Value;
myStudent.Memo = txtMemo.Text.Trim();
myStudent.Address = txtAddress.Text.Trim();
myStudent.photo = Image.FromFile(openFileDialog1.FileName);
//Insert New Record
if (myStudent.AddStudent(myStudent))
MessageBox.Show("Student Added Successfully");
}

J'obtiens l'erreur suivante

Pas de mapping existe de DbType Système.De dessin.Bitmap à un
SqlCeType.

Mais je ne sais pas pourquoi je ne suis pas succedding. Toute Suggestion serait très appréciée.