I work on asp.net I face issue when export grid view have more than 2000 rows it download empty file pdf without data inside .

and when click on file it give me file not in correct format or may be damaged with size 1 byte

so How to solve this issue and generate pdf file have more data and open it.

I don’t need to use base 64 because it small limit for data until 8000 characters

and data exported will have ore than this limit .

what I try as below :

 <div class="form-group col-12">
                                            <button id="btnSave" type="button" class="btn btn-outline-primary col-12" onclick="ExportGridViewToPdf();">
                                                <span style="font-size: 20px; line-height: 1.5;">'طباعة الاحصائية</span><i class="fas fa-print fa-fw fa-2x pull-center"></i></button>
                                        </div>
 <div class="mt-2 row">
                    <div class="form-group col-lg-12">
                        <div class="table-responsive">
                            <asp:GridView ID="gvResults" ClientIDMode="Static" runat="server"
                                ShowFooter="false" RowStyle-CssClass="record" CssClass="table table-striped table-hover table-bordered direction gridview-scroll  customCard card-outline-primary"
                                PageSize="5" Width="100%" border="0" CellSpacing="2" CellPadding="0"
                                AutoGenerateColumns="false">
                                <RowStyle HorizontalAlign="Center" CssClass="record " />

                                <HeaderStyle CssClass="table-info text-center" />

                            </asp:GridView>
                        </div>
                    </div>
                </div>
 
function ExportGridViewToPdf() {
debugger;
    var tableData = [];
    var columns = [];

    // Get the data from the GridView
    $('#gvResults tr').each(function (index) {
        if (index === 0) {
            // Get the column names
            $(this).find('th').each(function () {
                columns.push($(this).text());
            });
        } else {
            var rowData = [];
            $(this).find('td').each(function () {
                rowData.push($(this).text());
            });
            tableData.push(rowData);
        }
    });
 
    // Make an AJAX call to the server-side method
    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        url: "../BusinessLayer/WebMethods.asmx/ExportGridViewToPdf",
        data: JSON.stringify({ gridData: tableData, columnNames: columns }),
        responseType: 'arraybuffer',
        processData: false,
        

        success: function (response) {
           

            var fileName = "GridView.pdf";
            var blob = new Blob([response.d], { type: 'application/pdf' });
            var downloadLink = document.createElement("a");
            downloadLink.href = window.URL.createObjectURL(blob);
            downloadLink.setAttribute("download", fileName);
            document.body.appendChild(downloadLink);
            downloadLink.click();
            document.body.removeChild(downloadLink);

        },
        error: function (xhr, status, error) {
            // Handle the error response
            console.error("Error exporting PDF: " + error);
        }
    });
}
   [WebMethod]
        public byte[] ExportGridViewToPdf(string[][] gridData, string[] columnNames)
        {
            try
            {
                // Create a new PDF document
                var document = new Document(PageSize.A4, 25, 25, 30, 30);
                var ms = new MemoryStream();
                var writer = PdfWriter.GetInstance(document, ms);
                document.Open();

                // Add the table to the PDF document
                var table = new PdfPTable(columnNames.Length);
                table.WidthPercentage = 100;

                // Add the column headers
                foreach (var columnName in columnNames)
                {
                    var cell = new PdfPCell(new Phrase(columnName));
                    cell.BackgroundColor = new BaseColor(System.Drawing.Color.LightGray);
                    table.AddCell(cell);
                }

                // Add the data rows
                foreach (var row in gridData)
                {
                    foreach (var value in row)
                    {
                        table.AddCell(value);
                    }
                }

                document.Add(table);
                document.Close();
                writer.Close();
                HttpContext.Current.Response.ContentType = "application/pdf";
                return ms.ToArray();
            }
            catch (Exception ex)
            {
                // Handle the exception
                throw new Exception("Error exporting GridView to PDF: " + ex.Message);
            }
        }