private void UpdateDatabase()
        {
            DB.Open();
            DB.BeginTransaction();
            try
            {
                int companyId = Int32.Parse(hdfCompanyId.Value);
                int loginId = Convert.ToInt32(Session["loginID"]);

                if (cbxEndConfirm.Checked)
                {
                    ProjectCombinedCostingSheetAddBasicInformation projectCostingSheetAddBasicInformation = new ProjectCombinedCostingSheetAddBasicInformation(projectCostingSheetAddTDS);
                    int costingSheetId = projectCostingSheetAddBasicInformation.Save(companyId);
                    hdfCostingSheetId.Value = costingSheetId.ToString();

                    // Save costs information
                    ProjectCombinedCostingSheetAddLabourHoursInformation projectCostingSheetAddLabourHoursInformation = new ProjectCombinedCostingSheetAddLabourHoursInformation(projectCostingSheetAddTDS);
                    projectCostingSheetAddLabourHoursInformation.Save(companyId, costingSheetId);

                    ProjectCombinedCostingSheetAddUnitsInformation projectCostingSheetAddUnitsInformation = new ProjectCombinedCostingSheetAddUnitsInformation(projectCostingSheetAddTDS);
                    projectCostingSheetAddUnitsInformation.Save(companyId, costingSheetId);

                    ProjectCombinedCostingSheetAddMaterialsInformation projectCostingSheetAddMaterialsInformation = new ProjectCombinedCostingSheetAddMaterialsInformation(projectCostingSheetAddTDS);
                    projectCostingSheetAddMaterialsInformation.Save(companyId, costingSheetId);

                    ProjectCombinedCostingSheetAddSubcontractorsInformation projectCostingSheetAddSubcontractorsInformation = new ProjectCombinedCostingSheetAddSubcontractorsInformation(projectCostingSheetAddTDS);
                    projectCostingSheetAddSubcontractorsInformation.Save(companyId, costingSheetId);

                    ProjectCombinedCostingSheetAddOtherCostsInformation projectCostingSheetAddOtherCostsInformation = new ProjectCombinedCostingSheetAddOtherCostsInformation(projectCostingSheetAddTDS);
                    projectCostingSheetAddOtherCostsInformation.Save(companyId, costingSheetId);

                    ProjectCombinedCostingSheetAddRevenueInformation projectCostingSheetAddRevenueInformation = new ProjectCombinedCostingSheetAddRevenueInformation(projectCostingSheetAddTDS);
                    projectCostingSheetAddRevenueInformation.Save(companyId, costingSheetId);

                    if (rbtnBeginTemplate.Checked)
                    {
                        ProjectCostingSheetTemplateInformation projectCostingSheetTemplateInformation = new ProjectCostingSheetTemplateInformation(projectCostingSheetAddTDS);
                        projectCostingSheetTemplateInformation.Save(companyId);
                    }
                }
                else
                {
                    if (cbxEndSave.Checked)
                    {
                        ProjectCostingSheetTemplateInformation projectCostingSheetTemplateInformation = new ProjectCostingSheetTemplateInformation(projectCostingSheetAddTDS);
                        projectCostingSheetTemplateInformation.Save(companyId);
                    }
                    else
                    {
                        if (rbtnBeginTemplate.Checked)
                        {
                            ProjectCostingSheetTemplateInformation projectCostingSheetTemplateInformation = new ProjectCostingSheetTemplateInformation(projectCostingSheetAddTDS);
                            projectCostingSheetTemplateInformation.Save(companyId);
                        }
                    }
                }

                DB.CommitTransaction();

                // Store datasets
                projectCostingSheetAddTDS.AcceptChanges();
                Session["projectCostingSheetAddTDS"] = projectCostingSheetAddTDS;

            }
            catch (Exception ex)
            {
                DB.RollbackTransaction();

                string url = string.Format("./../../error_page.aspx?error={0}", ex.Message.Replace('\n', ' '));
                Response.Redirect(url);
            }
        }