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Printing in ASP.NET

One of the most common functionality in any ASP.NET application is to print forms and controls.

In this article, I am going to show how can we achieve this print functionality in our asp.net application. For this, I created a PrintHelper class. In this class, I made a method 'PrintWebControl'. With this method we can print any server control alike GridView, DataGrid, Panel, TextBox etc.

This is my PrintHelper.cs

  1. using System;  
  2. using System.Data;  
  3. using System.Configuration;  
  4. using System.Web;  
  5. using System.Web.Security;  
  6. using System.Web.UI;  
  7. using System.Web.UI.WebControls;  
  8. using System.Web.UI.WebControls.WebParts;  
  9. using System.Web.UI.HtmlControls;  
  10. using System.IO;  
  11. using System.Text;  
  12. using System.Web.SessionState;  
  13. /// <summary>  
  14. /// Summary description for PrintHelper  
  15. /// </summary>  
  16. public class PrintHelper  
  17. {  
  18.     public PrintHelper()  
  19.     {  
  20.         //  
  21.         // TODO: Add constructor logic here  
  22.         //  
  23.     }  
  24.     public static void PrintWebControl(Control ctrl)  
  25.     {  
  26.         PrintWebControl(ctrl, string.Empty);  
  27.     }  
  28.     public static void PrintWebControl(Control ctrl, string Script)  
  29.     {  
  30.         StringWriter stringWrite = new StringWriter();  
  31.         System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);  
  32.         if (ctrl is WebControl)  
  33.         {  
  34.             Unit w = new Unit(100, UnitType.Percentage); ((WebControl)ctrl).Width = w;  
  35.         }  
  36.         Page pg = new Page();  
  37.         pg.EnableEventValidation = false;  
  38.         if (Script != string.Empty)  
  39.         {  
  40.             pg.ClientScript.RegisterStartupScript(pg.GetType(), "PrintJavaScript", Script);  
  41.         }  
  42.         HtmlForm frm = new HtmlForm();  
  43.         pg.Controls.Add(frm);  
  44.         frm.Attributes.Add("runat", "server");  
  45.         frm.Controls.Add(ctrl);  
  46.         pg.DesignerInitialize();  
  47.         pg.RenderControl(htmlWrite);  
  48.         string strHTML = stringWrite.ToString();  
  49.         HttpContext.Current.Response.Clear();  
  50.         HttpContext.Current.Response.Write(strHTML);  
  51.         HttpContext.Current.Response.Write("<script>window.print();</script>");  
  52.         HttpContext.Current.Response.End();  
  53.     }  
  54. }  
Here, in this application, I created 2 pages. First is the default page of the content that I want to print.On the same page, I set a Print button also. When it will be clicked, it will redirect the user to the second page, named as 'Print.aspx'.

Default.aspx 

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>  
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
  3. <html xmlns="http://www.w3.org/1999/xhtml">  
  4. <head runat="server">  
  5.     <title>Pring in ASP.NET</title>  
  6. </head>  
  7. <body>  
  8.     <form id="form1" runat="server">  
  9.         <div>  
  10.             <asp:Button ID="btnPrint" runat="server" Text="Print" OnClick="btnPrint_Click" /><br />  
  11.             <asp:Panel ID="pnl1" runat="server">  
  12.                 <table cellpadding="4" cellspacing="4" width="50%" align="center">  
  13.                     <tr>  
  14.                         <td align="center">  
  15.                             Fill all information  
  16.                         </td>  
  17.                     </tr>  
  18.                     <tr>  
  19.                         <td>  
  20.                             <asp:Label ID="Label1" runat="server" Text="Email" Width="130px"></asp:Label>  
  21.                             <asp:TextBox runat="server"></asp:TextBox>  
  22.                         </td>  
  23.                     </tr>  
  24.                     <tr>  
  25.                         <td>  
  26.                             <asp:Label ID="Label2" runat="server" Text="Name" Width="130px"></asp:Label>  
  27.                             <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>  
  28.                         </td>  
  29.                     </tr>  
  30.                     <tr>  
  31.                         <td>  
  32.                             <asp:Label ID="Label6" runat="server" Text="Country" Width="130px"></asp:Label>  
  33.                             <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>  
  34.                         </td>  
  35.                     </tr>  
  36.                     <tr>  
  37.                         <td>  
  38.                             <asp:Label ID="Label3" runat="server" Text="Mobile" Width="130px"></asp:Label>  
  39.                             <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>  
  40.                         </td>  
  41.                     </tr>  
  42.                 </table>  
  43.             </asp:Panel>  
  44.         </div>  
  45.     </form>  
  46. </body>  
  47. </html>

PrintImage1.JPG

Image 1.

 

Click event of 'print' button is

  1. protected void btnPrint_Click(object sender, EventArgs e)  
  2. {  
  3.         Session["ctrl"] = pnl1;  
  4.         ClientScript.RegisterStartupScript(this.GetType(), "onclick", "<script language=javascript>window.open('Print.aspx','PrintMe','height=300px,width=300px,scrollbars=1');</script>");  
  5. }  

When, the 'Print' button is clicked,screen will be looking as under in the Image 2

PrintImage2.JPG 

Image 2.

 

Following is the load event of this page, 'Print.aspx'

  1. protected void Page_Load(object sender, EventArgs e)  
  2. {  
  3.     Control ctrl = (Control)Session["ctrl"];  
  4.      PrintHelper.PrintWebControl(ctrl);  
  5. }


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