DotNetOcean: Print Functionality in ASPDOTNET

Wednesday, December 28

Print Functionality in ASPDOTNET

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

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Text;

using System.Web.SessionState;

/// <summary>

/// Summary description for PrintHelper

/// </summary>

public class PrintHelper

{

public PrintHelper()

{

// TODO: Add constructor logic here

}

public static void PrintWebControl(Control ctrl)

{

PrintWebControl(ctrl, string.Empty);

}

public static void PrintWebControl(Control ctrl, string Script)

{

StringWriter stringWrite = new StringWriter();

System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);

if (ctrl is WebControl)

{

Unit w = new Unit(100, UnitType.Percentage); ((WebControl)ctrl).Width = w;

}

Page pg = new Page();

pg.EnableEventValidation = false;

if (Script != string.Empty)

{

pg.ClientScript.RegisterStartupScript(pg.GetType(), "PrintJavaScript", Script);

}

HtmlForm frm = new HtmlForm();

pg.Controls.Add(frm);

frm.Attributes.Add("runat", "server");

frm.Controls.Add(ctrl);

pg.DesignerInitialize();

pg.RenderControl(htmlWrite);

string strHTML = stringWrite.ToString();

HttpContext.Current.Response.Clear();

HttpContext.Current.Response.Write(strHTML);

HttpContext.Current.Response.Write("<script>window.print();</script>");

HttpContext.Current.Response.End();

}

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

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Pring in ASP.NET</title>

</head>

<body>

<div>

<asp:Button ID="btnPrint" runat="server" Text="Print" OnClick="btnPrint_Click" /><br />

<asp:Panel ID="pnl1" runat="server">

<tr>

Fill all information

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label1" runat="server" Text="Email" Width="130px"></asp:Label>

<asp:TextBox runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label2" runat="server" Text="Name" Width="130px"></asp:Label>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label6" runat="server" Text="Country" Width="130px"></asp:Label>

<asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<td>

<asp:Label ID="Label3" runat="server" Text="Mobile" Width="130px"></asp:Label>

<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

</td>

</tr>

</table>

</asp:Panel>

</div>

</form>

</body>

</html>

Image 1.

Click event of 'print' button is:

protected void btnPrint_Click(object sender, EventArgs e)

{

Session["ctrl"] = pnl1;

ClientScript.RegisterStartupScript(this.GetType(), "onclick", "<script language=javascript>window.open('Print.aspx','PrintMe','height=300px,width=300px,scrollbars=1');</script>");

}

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