/// <summary>
        /// Save all materials to database (direct)
        /// </summary>
        /// <param name="companyId">companyId</param>        
        public void Save(int companyId)
        {
            MaterialInformationTDS materialInformationChanges = (MaterialInformationTDS)Data.GetChanges();

            if (materialInformationChanges.MaterialInformation.Rows.Count > 0)
            {
                MaterialInformationGateway materialInformationGateway = new MaterialInformationGateway(materialInformationChanges);

                foreach (MaterialInformationTDS.MaterialInformationRow row in (MaterialInformationTDS.MaterialInformationDataTable)materialInformationChanges.MaterialInformation)
                {
                    // Insert new materials
                    if ((!row.Deleted) && (!row.InDatabase))
                    {
                        AssetSewerMaterial assetSewerMaterial = new AssetSewerMaterial(null);
                        assetSewerMaterial.InsertDirect(row.AssetID, row.RefID, row.MaterialType, row.Date_, row.Deleted, row.COMPANY_ID);
                    }

                    // Update materials
                    if ((!row.Deleted) && (row.InDatabase))
                    {
                        int assetId = row.AssetID;
                        int refId = row.RefID;
                        bool originalDeleted = false;
                        int originalCompanyId = companyId;

                        // original values
                        string originalMaterialType = materialInformationGateway.GetMaterialTypeOriginal(assetId, refId);
                        DateTime originalDate_ = materialInformationGateway.GetDate_Original(assetId, refId);

                        // new values
                        string newMaterialType = materialInformationGateway.GetMaterialType(assetId, refId);

                        AssetSewerMaterial assetSewerMaterial = new AssetSewerMaterial(null);
                        assetSewerMaterial.UpdateDirect(assetId, refId, originalMaterialType, originalDate_, originalCompanyId, originalDeleted, assetId, refId, newMaterialType, originalDate_, originalCompanyId, originalDeleted);
                    }

                    // Deleted materials
                    if ((row.Deleted) && (row.InDatabase))
                    {
                        AssetSewerMaterial assetSewerMaterial = new AssetSewerMaterial(null);
                        assetSewerMaterial.DeleteDirect(row.AssetID, row.RefID, row.COMPANY_ID);
                    }
                }
            }
        }
        protected void grdMaterials_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if ((e.Row.RowType == DataControlRowType.DataRow) && ((e.Row.RowState == DataControlRowState.Edit) || (e.Row.RowState == (DataControlRowState.Edit | DataControlRowState.Alternate))))
            {
                int assetId = Int32.Parse(hdfAssetId.Value);
                int companyId = Int32.Parse(hdfCompanyId.Value);
                int refId = Int32.Parse(((Label)e.Row.FindControl("lblRefIDEdit")).Text.Trim());

                MaterialInformationGateway materialInformationGateway = new MaterialInformationGateway(materialInformationTDS);
                string materialType = materialInformationGateway.GetMaterialType(assetId, refId);

                ((DropDownList)e.Row.FindControl("ddlMaterialTypeEdit")).SelectedValue = materialType;
            }
        }