How to add PDF form fields inside the grid cell

        //Initial declaration
        PdfDocument document;
        PdfForm form;
        PdfPage tempPage;
 
        private void button1_Click(object sender, EventArgs e)
        {
            //Create a new PDF document.
            document = new PdfDocument();
 
            //Add a page.
            PdfPage page = document.Pages.Add();
 
            form = document.Form;
 
            //Create a PdfGrid.
            PdfGrid pdfGrid = new PdfGrid();
 
            // Add column 
            pdfGrid.Columns.Add(3);
 
            //Add the grid row 
            for (int i = 0; i < 2; i++)
            {
                PdfGridRow row = pdfGrid.Rows.Add();
                for (int j = 0; j < 3; j++)
                {
                    if (i == 0 && j == 0)
                        row.Cells[j].Value = "TextBox Field";
 
                    if (i == 0 && j == 1)
                        row.Cells[j].Value = "CheckBox Field";
 
                    if (i == 0 && j == 2)
                        row.Cells[j].Value = "ComboBox Field";
                }
                //Sets row height
                row.Height = 10;
            }
 
            pdfGrid.BeginCellLayout += pdfGrid_BeginCellLayout;
            pdfGrid.BeginPageLayout += pdfGrid_BeginPageLayout;
 
            //Draw grid to the page of PDF document.
            pdfGrid.Draw(page, new PointF(10, 10));
 
            //Save the document.
            document.Save("FormField.pdf");
 
            //close the document
            document.Close(true);
        }
 
        //Begin Page Layout Event Handler
        private void pdfGrid_BeginPageLayout(object sender, BeginPageLayoutEventArgs e)
        {
            tempPage = e.Page;
        }
 
        //Raises the before cell layout.
        private void pdfGrid_BeginCellLayout(object sender, PdfGridBeginCellLayoutEventArgs args)
        {
            if (args.RowIndex == 1 && args.CellIndex == 0)
            {
                //Add textbox field
                PdfTextBoxField textbox = new PdfTextBoxField(tempPage, "Name");
                textbox.Font = new PdfStandardFont(PdfFontFamily.Helvetica, 12);
                textbox.Bounds = new RectangleF(args.Bounds.X , args.Bounds.Y, args.Bounds.Width, args.Bounds.Height);
                textbox.Text = "TextBox";
                form.Fields.Add(textbox);
            }
            else if (args.RowIndex == 1 && args.CellIndex == 1)
            {
                //Add checkbox field
                PdfCheckBoxField checkField = new PdfCheckBoxField(tempPage, "UG");
                checkField.Bounds = new RectangleF(args.Bounds.X +2, args.Bounds.Y, args.Bounds.Width / 2, args.Bounds.Height - 1);
                checkField.Checked = true;
                //Sets checkbox style
                checkField.Style = PdfCheckBoxStyle.Cross;
                form.Fields.Add(checkField);
            }
            else if(args.RowIndex == 1 && args.CellIndex == 2)
            {
                //Add combobox filed
                PdfComboBoxField comboBox = new PdfComboBoxField(tempPage, "JobTitle"); //Sets the combo box properties.
                comboBox.Bounds = new RectangleF(args.Bounds.X , args.Bounds.Y, args.Bounds.Width / 2, args.Bounds.Height - 1);
                comboBox.BorderWidth = 1; 
                comboBox.BorderColor = new PdfColor(Color.Gray);
                //Sets tooltip. 
                comboBox.ToolTip = "Job Title"; 
                //Adds list items. 
                comboBox.Items.Add(new PdfListFieldItem("Development", "accounts"));
                comboBox.Items.Add(new PdfListFieldItem("Support", "advertise"));
                comboBox.Items.Add(new PdfListFieldItem("Documentation", "agri"));
                form.Fields.Add(comboBox);
            }
        }