Загрузка картинки в blob

public void Add(string photoFilePath)
    {
        byte[] photo = GetPhoto(photoFilePath);

        OleDbConnection nwindConn = new OleDbConnection();
        nwindConn.ConnectionString = ConfigurationManager.ConnectionStrings["myconnect"].ConnectionString;

        OleDbCommand addEmp = new OleDbCommand("INSERT INTO sp_mer (id_mer, name, picture) " +
                                           "Values(null, :name, :picture)", nwindConn);
   
        addEmp.Parameters.Add("name", OleDbType.VarChar,60).Value = "TESTTT";
     
        addEmp.Parameters.Add("picture", OleDbType.Binary,photo.Length).Value = photo;

        nwindConn.Open();
        addEmp.ExecuteNonQuery();
        nwindConn.Close();
    }

    public byte[] GetPhoto(string filePath)
    {
        FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fs);

        byte[] photo = br.ReadBytes((int)fs.Length);
        size = photo.Length;
        br.Close();
        fs.Close();
        return photo;
    }

addEmp.Parameters.Add("picture", OleDbType.Binary, SIZE).Value = photo;