How to Generate Invoice in Asp.Net

Here we will see how to generate invoice as Pdf file in asp.net. If anyone want invoice details then we must have to give him/her invoice details. 

HTML CODE:

<div>

<asp:Button ID="Button1" Text="Generate Invoice" OnClick="GenerateInvoicePDF" runat="server" />

</div>

CODE BEHIND:

protected void GenerateInvoicePDF(object sender, EventArgs e)

        {

            //Dummy data for Invoice (Bill).

            string companyName = "UK Paroducts";

            int orderNo = 000001;

            DataTable dt = new DataTable();

            dt.Columns.AddRange(new DataColumn[5] {

                              new DataColumn("ProductId", typeof(string)),

                              new DataColumn("Product", typeof(string)),

                              new DataColumn("Price", typeof(int)),

                              new DataColumn("Quantity",  typeof(int)),

                              new DataColumn("Total",  typeof(int))});

            dt.Rows.Add(101, "Sun Glasses", 200, 5, 1000);

            dt.Rows.Add(102, "Jeans", 400, 2, 800);

            dt.Rows.Add(103, "Trousers", 300, 3, 900);

            dt.Rows.Add(104, "Shirts", 550, 2, 1100);

            using (StringWriter sw = new StringWriter())

            {

                using (HtmlTextWriter hw = new HtmlTextWriter(sw))

                {

                    StringBuilder sb = new StringBuilder();

                    //Generate Invoice (Bill) Header.

                    sb.Append("<table width='100%' cellspacing='0' cellpadding='2'>");

                    sb.Append("<tr><td align='center' style='background-color: #18B5F0' colspan = '2'><b>Order Sheet</b></td></tr>");

                    sb.Append("<tr><td colspan = '2'></td></tr>");

                    sb.Append("<tr><td><b>Order No: </b>");

                    sb.Append(orderNo);

                    sb.Append("</td><td align = 'right'><b>Date: </b>");

                    sb.Append(DateTime.Now);

                    sb.Append(" </td></tr>");

                    sb.Append("<tr><td colspan = '2'><b>Company Name: </b>");

                    sb.Append(companyName);

                    sb.Append("</td></tr>");

                    sb.Append("</table>");

                    sb.Append("<br />");

                    //Generate Invoice (Bill) Items Grid.

                    sb.Append("<table border = '1'>");

                    sb.Append("<tr>");

                    foreach (DataColumn column in dt.Columns)

                    {

                        sb.Append("<th style = 'background-color: #D20B0C;color:#ffffff'>");

                        sb.Append(column.ColumnName);

                        sb.Append("</th>");

                    }

                    sb.Append("</tr>");

                    foreach (DataRow row in dt.Rows)

                    {

                        sb.Append("<tr>");

                        foreach (DataColumn column in dt.Columns)

                        {

                            sb.Append("<td>");

                            sb.Append(row[column]);

                            sb.Append("</td>");

                        }

                        sb.Append("</tr>");

                    }

                    sb.Append("<tr><td align = 'right' colspan = '");

                    sb.Append(dt.Columns.Count - 1);

                    sb.Append("'>Total</td>");

                    sb.Append("<td>");

                    sb.Append(dt.Compute("sum(Total)", ""));

                    sb.Append("</td>");

                    sb.Append("</tr></table>");

                    //Export HTML String as PDF.

                    StringReader sr = new StringReader(sb.ToString());

                    Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);

                    HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

                    PdfWriter writer = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

                    pdfDoc.Open();

                    htmlparser.Parse(sr);

                    pdfDoc.Close();

                    Response.ContentType = "application/pdf";

                    Response.AddHeader("content-disposition", "attachment;filename=Invoice_" + orderNo + ".pdf");

                    Response.Cache.SetCacheability(HttpCacheability.NoCache);

                    Response.Write(pdfDoc);

                    Response.End();

                }

            }

        }

Now run your webpage and click on button to generate invoice details.

Author : Umesh Patel

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