string existingPdfilePath = Server.MapPath("~/export/I-693_1000_202502191951256806.pdf");
 string updatedPdfPath = Server.MapPath("~/App_Data/I-693_" + Guid.NewGuid().ToString() + ".pdf");

 using (FileStream pdfReaderStream = new FileStream(existingPdfilePath, FileMode.Open, FileAccess.Read))
            {
                using (FileStream pdfWriterStream = new FileStream(updatedPdfPath, FileMode.Create, FileAccess.Write))
                {
                    PdfReader reader = new PdfReader(pdfReaderStream);
                    PdfStamper stamper = new PdfStamper(reader, pdfWriterStream);

                    AcroFields formFields = stamper.AcroFields;
                    foreach (DictionaryEntry de in reader.AcroFields.Fields)
                    {
                        //sb.Append(de.Key.ToString() + Environment.NewLine);
                        var fullname = formFields.GetTranslatedFieldName(de.Key.ToString());
                        formFields.RenameField(fullname, Guid.NewGuid().ToString("N"));
                        if (de.Key.ToString() != fullname)
                            if (!String.IsNullOrEmpty(de.Value.ToString()))
                            {
                                if (fullname != "form1[0].#pageSet[0].Page1[9].PDF417BarCode2[0]")
                                {
                                    formFields.SetField(de.Key.ToString(), de.Value.ToString());
                                }
                            }
                    }
                    stamper.Close();
                    reader.Close();
                }

        <telerik:RadGrid ID="gridTest" runat="server" AutoGenerateColumns="False" 

            Skin="Default" Width="800px"             
            OnItemCreated="gridTest_ItemCreated" >

            <ExportSettings 
                IgnorePaging="true" OpenInNewWindow="true" ExportOnlyData="False">
                <Pdf PaperSize="Letter"></Pdf>
            </ExportSettings>

            <MasterTableView ShowHeader="false">                 
                <Columns>
                    <telerik:GridTemplateColumn DataField="strCaseID" UniqueName="strCaseID" ShowFilterIcon="false" >
                        <ItemTemplate>

                            <table>
                                <tr>
                                    <td>
                                        TGIF!
                                    </td>
                                </tr>
                            </table>
                  
                            <asp:Label ID="lbName"                 runat="server" Text='<%#Eval("strEmployeeFName")%>'                ></asp:Label><br />
                            <asp:Label ID="lbAddressStreet1"       runat="server" Text='<%#Eval("strEmployeeAddressStreet1")%>'       ></asp:Label><br />
                            <asp:Label ID="lbAddressStreet2"       runat="server" Text='<%#Eval("strEmployeeAddressStreet2")%>'       ></asp:Label><br />
                            <asp:Label ID="lbAddressCity"          runat="server" Text='<%#Eval("strEmployeeAddressCity")%>'          ></asp:Label><br />
                            <asp:Label ID="lbAddressState"         runat="server" Text='<%#Eval("strEmployeeAddressState")%>'         ></asp:Label><br />
                            <asp:Label ID="lbAddressZip"           runat="server" Text='<%#Eval("strEmployeeAddressZip")%>'           ></asp:Label><br />

                        </ItemTemplate>
                    </telerik:GridTemplateColumn>
                </Columns>
            </MasterTableView>

        </telerik:RadGrid>
		
        in Page_Load...
		
		    PopulateGrid(gridTest);
            ConfigureGridBeforeExportToPdf();
            gridTest.MasterTableView.ExportToPdf();

        protected void gridTest_ItemCreated(object sender, GridItemEventArgs e)
        {
            try
            {
                ConfigureGridItem(e.Item);
            }
            catch (Exception ex)
            {
                // do stuff
            }
        }

        protected void ConfigureGridItem(GridItem item)
        {
            // ***** THIS IS FOR - each Item

            item.Style["color"] = "purple"; // font color

            if (item is GridHeaderItem)
            {
                item.Visible = false;
            }
            else if (item is GridDataItem)
            {
                item.Style["vertical-align"] = "middle";
                item.Style["text-align"] = "left";
            }

            switch (item.ItemType)
            {
                case GridItemType.Item: item.Style["background-color"] = "lightyellow"; break;
                case GridItemType.AlternatingItem: item.Style["background-color"] = "mistyrose"; break;
            }
        }

        public void ConfigureGridBeforeExportToPdf()
        {
            // ***** THIS IS FOR - entire Grid

            // format - Pdf Settings
            gridTest.ExportSettings.Pdf.BorderType = GridPdfSettings.GridPdfBorderType.OuterBorders;
            gridTest.ExportSettings.Pdf.BorderStyle = GridPdfSettings.GridPdfBorderStyle.Thick;
            gridTest.ExportSettings.Pdf.BorderColor = System.Drawing.Color.HotPink;
            gridTest.ExportSettings.Pdf.PaperSize = GridPaperSize.Letter;
            gridTest.ExportSettings.Pdf.PageHeight = Unit.Parse("162mm");
            gridTest.ExportSettings.Pdf.PageWidth = Unit.Parse("600mm");

            // format - header
            GridItem headerItem = gridTest.MasterTableView.GetItems(GridItemType.Header)[0];
            headerItem.Visible = false;

            // format - footer
            gridTest.ExportSettings.Pdf.PageFooter.MiddleCell.Text = "<?page-number?>";
            gridTest.ExportSettings.Pdf.PageFooter.MiddleCell.TextAlign = GridPdfPageHeaderFooterCell.CellTextAlign.Center;
        }