How to fill continuous page number in pdf form field

//Load the template document

PdfLoadedDocument doc = new PdfLoadedDocument(”Form.pdf");

PdfLoadedForm form = doc.Form;

// fill the fields from the first page

(form.Fields["f1-1"] as PdfLoadedTextBoxField).Text = "1";

(form.Fields["f1-2"] as PdfLoadedTextBoxField).Text = "1";

(form.Fields["f1-3"] as PdfLoadedTextBoxField).Text = "1";

(form.Fields["f1-4"] as PdfLoadedTextBoxField).Text = "3";

(form.Fields["f1-5"] as PdfLoadedTextBoxField).Text = "1";

(form.Fields["f1-6"] as PdfLoadedTextBoxField).Text = "1";

(form.Fields["f1-7"] as PdfLoadedTextBoxField).Text = "22";

(form.Fields["f1-8"] as PdfLoadedTextBoxField).Text = "30";

(form.Fields["f1-9"] as PdfLoadedTextBoxField).Text = "John";

(form.Fields["f1-10"] as PdfLoadedTextBoxField).Text = "Doe";

(form.Fields["f1-11"] as PdfLoadedTextBoxField).Text = "3233 Spring Rd.";

(form.Fields["f1-12"] as PdfLoadedTextBoxField).Text = "Atlanta, GA 30339";

(form.Fields["c1-1[0]"] as PdfLoadedCheckBoxField).Items[0].Checked = true;

(form.Fields["c1-1[1]"] as PdfLoadedCheckBoxField).Items[0].Checked = true;

// fill the fields from the second page

(form.Fields["f2-1"] as PdfLoadedTextBoxField).Text = "3200";

(form.Fields["f2-2"] as PdfLoadedTextBoxField).Text = "4850";

(form.Fields["f2-3"] as PdfLoadedTextBoxField).Text = "0";

(form.Fields["f2-4"] as PdfLoadedTextBoxField).Text = "500";

(form.Fields["f2-5"] as PdfLoadedTextBoxField).Text = "500";

(form.Fields["f2-6"] as PdfLoadedTextBoxField).Text = "800";

(form.Fields["f2-7"] as PdfLoadedTextBoxField).Text = "0";

(form.Fields["f2-8"] as PdfLoadedTextBoxField).Text = "0";

(form.Fields["f2-9"] as PdfLoadedTextBoxField).Text = "3";

(form.Fields["f2-10"] as PdfLoadedTextBoxField).Text = "3";

(form.Fields["f2-11"] as PdfLoadedTextBoxField).Text = "3";

(form.Fields["f2-12"] as PdfLoadedTextBoxField).Text = "2";

doc.Save("sample.pdf");