How to check checkbo in loop on overall submit button click in WPF C#

try
            {
                for (int i = 0; i < dataGrid.Items.Count; i++)
                {
                    DataRowView dataRowView = (DataRowView)((Button)e.Source).DataContext;
                    String ProductName = dataRowView[1].ToString();
                    String ProductDescription = dataRowView[2].ToString();
                    id = dataRowView[0].ToString();
                    if ((sender as CheckBox).IsChecked == true)
                    {
                        { Assign = "True"; }
                    }
                    else
                    {
                        { Assign = "False"; }
                    }
                    SqlConnection con = new SqlConnection(Globals.ConnectionString);
                    con.Open();
                    SqlCommand cmd = new SqlCommand("sp_mod_assign", con);
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.AddWithValue("@mod_id", SqlDbType.Int).Value = string.IsNullOrWhiteSpace(id) ? DBNull.Value : (object)id;
                    cmd.Parameters.AddWithValue("@assign", SqlDbType.VarChar).Value = string.IsNullOrWhiteSpace(Assign) ? DBNull.Value : (object)Assign;
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
                
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

private void CheckBox_Checked(object sender, RoutedEventArgs e)
   {
       DataRowView row;
       row = (DataRowView)((CheckBox)e.OriginalSource).DataContext;
       //row["Assign"] = "True";
   }

private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
       {
           DataRowView row;
           row = (DataRowView)((CheckBox)e.OriginalSource).DataContext;
           //row["Assign"] = "False";
       }