Я получаю следующую ошибку при сериализации объекта в пары.

Type 'System.Data.DataRow' in Assembly 'System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable

DataTable mytable = new DataTable("mytable");
        getMaxWorkID = Convert.ToInt32(objSQL.ExecuteSclar("select ISNULL(Max(workId),0) as workId from T_cuttingList"));
        con.Open();
        SqlCommand cmd = new SqlCommand("sp_cuttingMeasurement", con);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@mode", "selectHead");
        cmd.Parameters.AddWithValue("@workId", getMaxWorkID);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dtHead = new DataTable();
        da.Fill(dtHead);
        con.Close();
        int sno = 0;
        DataRow dr = null;
        if (dtHead.Rows.Count > 0)
        {
            
            foreach (DataRow rows in dtHead.Rows)
            {
                // Head to add mytable **** START ***
                if (ViewState["Row"] != null)
                {
                    mytable = (DataTable)ViewState["Row"];
                    if (mytable.Rows.Count > 0)
                    {
                        dr = mytable.NewRow();
                        sno = sno + 1;
                        dr["SNo"] = sno;
                        dr["Type"] = rows["Type"].ToString();
                        dr["Size"] = rows["Size"].ToString();
                        dr["Height"] = string.Empty;
                        dr["Nos"] = string.Empty;
                        dr["typeval"] = string.Empty;
                        dr["Sqft"] = string.Empty;
                        mytable.Rows.Add(dr);
                        ViewState["Row"] = mytable; 
                    }  
                }
                else
                {
                    mytable.Columns.AddRange(new DataColumn[7] { new DataColumn("SNo", typeof(string)),
                            new DataColumn("Type", typeof(string)),
                            new DataColumn("Size", typeof(string)),
                            new DataColumn("Height", typeof(string)),
                            new DataColumn("Nos", typeof(string)),
                            new DataColumn("typeval", typeof(string)),
                            new DataColumn("Sqft",typeof(string)) });

                    dr = mytable.NewRow();
                    sno = sno + 1;
                    dr["SNo"] = sno;
                    dr["Type"] = rows["Type"].ToString();
                    dr["Size"] = rows["Size"].ToString();
                    dr["Height"] = string.Empty;
                    dr["Nos"] = string.Empty;
                    dr["typeval"] = string.Empty;
                    dr["Sqft"] = string.Empty;
                    mytable.Rows.Add(dr);
                    ViewState["Row"] = mytable; 
                }
                // Head to add mytable **** END ***

                // Child Parent to add mytable **** START ***
                int headId = 0;
                headId = Convert.ToInt32(rows["Id"].ToString());
                ViewState["workId"] = rows["workId"].ToString();
                con.Open();
                SqlCommand cmd1 = new SqlCommand("sp_cuttingMeasurement", con);
                cmd1.CommandType = CommandType.StoredProcedure;
                cmd1.Parameters.AddWithValue("@mode", "getparent");
                cmd1.Parameters.AddWithValue("@cId", headId);
                SqlDataAdapter da1 = new SqlDataAdapter(cmd1);
                DataTable dtparent = new DataTable();
                da1.Fill(dtparent);
                con.Close();

                if (dtparent.Rows.Count > 0)
                {
                    foreach (DataRow drparent in dtparent.Rows)
                    {
                        if (ViewState["Row"] != null)
                        {
                            mytable = (DataTable)ViewState["Row"];
                            if (mytable.Rows.Count > 0)
                            {
                                dr = mytable.NewRow();
                                dr["SNo"] = string.Empty;
                                dr["Type"] = string.Empty;
                                dr["Size"] = drparent["width"].ToString();
                                dr["Height"] = drparent["height"].ToString();
                                dr["Nos"] = drparent["nos"].ToString();
                                dr["typeval"] = drparent["extra"].ToString();
                                dr["Sqft"] = drparent["sqft"].ToString();
                                mytable.Rows.Add(dr);
                                ViewState["Row"] = mytable;
                            }
                        }
                    }
                }
                // Child Parent to add mytable **** END ***


                // Draw / Shutter to add mytable **** START ***
                int typeId = 0; string AtMode = "";
                typeId = Convert.ToInt32(rows["typeId"].ToString());

                con2.Open();
                SqlCommand cmd8 = new SqlCommand("sp_cuttingMeasurement", con2);
                cmd8.CommandType = CommandType.StoredProcedure;
                cmd8.Parameters.AddWithValue("@mode", "selDrawShutterFMD3");
                cmd8.Parameters.AddWithValue("@typeId", typeId);
                cmd8.Parameters.AddWithValue("@Id", headId);
                SqlDataAdapter da8 = new SqlDataAdapter(cmd8);
                DataTable dtparent1 = new DataTable();
                da8.Fill(dtparent1);
                con2.Close();
                ViewState["parent1"] = null;
                if (dtparent1.Rows.Count > 0)
                {
                    foreach (DataRow drparent1 in dtparent1.Rows)
                    {
                        if (ViewState["Row"] != null)
                        {
                            mytable = (DataTable)ViewState["Row"];
                            if (mytable.Rows.Count > 0)
                            {
                                if (ViewState["parent1"] != null)
                                {
                                    dr = mytable.NewRow();
                                    dr["SNo"] = string.Empty;
                                    dr["Type"] = string.Empty;
                                    dr["Size"] = drparent1["width"].ToString();
                                    dr["Height"] = drparent1["height"].ToString();
                                    dr["Nos"] = drparent1["nos"].ToString();
                                    dr["typeval"] = drparent1["stype"].ToString();
                                    dr["Sqft"] = drparent1["sqft"].ToString();
                                    mytable.Rows.Add(dr);
                                    ViewState["Row"] = mytable;
                                    ViewState["parent1"] = drparent1;
                                }
                                else
                                {
                                    dr = mytable.NewRow();
                                    dr["SNo"] = string.Empty;
                                    dr["Type"] = "Draw/Shutter";
                                    dr["Size"] = rows["hwidth"].ToString();
                                    dr["Height"] = rows["hheight"].ToString();
                                    dr["Nos"] = string.Empty;
                                    dr["typeval"] = string.Empty;
                                    dr["Sqft"] = string.Empty;
                                    mytable.Rows.Add(dr);

                                    dr = mytable.NewRow();
                                    dr["SNo"] = string.Empty;
                                    dr["Type"] = string.Empty;
                                    dr["Size"] = drparent1["width"].ToString();
                                    dr["Height"] = drparent1["height"].ToString();
                                    dr["Nos"] = drparent1["nos"].ToString();
                                    dr["typeval"] = drparent1["stype"].ToString();
                                    dr["Sqft"] = drparent1["sqft"].ToString();
                                    mytable.Rows.Add(dr);
                                    ViewState["Row"] = mytable;
                                    ViewState["parent1"] = drparent1;
                                }
                            }
                        }
                    }
                }
                // Draw / Shutter to add mytable **** END ***


            }         
        }

By reading the exception, it looks like there is a dataRow in the object which is not serialized.

How can I identify the dataRow which is causing this problem in my code?