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Sunday, 29 May 2016

Export Grid View To PDF

 1 comment   

Introduction

In this article i will explain you how to export (Download) all Grid data in PDF(PORtable Document Format) file.

Description

Here i repeat the same process as i did my previous update to export (Download) all Grid data in CSV(Comma Separated Values) file. 

Database Design

Create Database EmployeeDb
Use EmployeeDb

Create table Employee( Id int Identity(1,1), Name varchar(50),EmailId nvarchar(250), Address varchar(max) , MobileNo int )

Aspx page View

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
  
        <form id="form1" runat="server"> 
        <div> <br /> <br /> 
              <asp:GridView ID="gvUserInfo" runat="server"  AutoGenerateColumns="false" CellPadding="4" ForeColor="#333333">
                <Columns>
                    <asp:BoundField DataField="Name" HeaderText="Name"  ItemStyle-Width="150px" />
                    <asp:BoundField DataField="EmailID" HeaderText="Email Id" ItemStyle-Width="150px"  />
                    <asp:BoundField DataField="Address" HeaderText="Address" ItemStyle-Width="140px" />
                    <asp:BoundField DataField="MobileNo" HeaderText="Mobile No" ItemStyle-Width="140px" />
                </Columns>
                   <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> 
                <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            </asp:GridView>
            <asp:Button ID="btnExport" runat="server" OnClick="btnExport_Click" Text="Export To PDF" /> </div> <br /> <br/>
                     </form>
</body>
</html>

After completing the design phase go to view code window and write the code given  below

For exporting grid data in PDF we have to use iText library. According to Itext description iText is a PDF library that allows you to CREATE, ADAPT, INSPECT and MAINTAIN documnets in the PRtable Document Format(PDF).
You don't have itext library on your project, to get iText library on your project use microsoft NuGet package Manager.
Goto Tools => NuGet package Manager.=> Manage NuGet package for solution ==> on serach tab type iText and hit search and installed the library for your project.



Namespaces

using iTextSharp.text;
using iTextSharp.text.html.simpleparser;
using iTextSharp.text.pdf;

CS page View 

   public override void VerifyRenderingInServerForm(Control control)
    {
        /* Verifies that the control is rendered*/
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindGrid();
        }
    }
    //method for Displaying Data in Gridview 
    protected void BindGrid()
    {
        SqlConnection con = new SqlConnection("Data Source=JP-PC\\JP;Initial            Catalog=EmployeeDb;Integrated Security=true;");
        SqlCommand cmd = new SqlCommand("SELECT * FROM Employee", con);
        con.Open();
        DataSet ds = new DataSet();
        SqlDataAdapter adp = new SqlDataAdapter(cmd);
        adp.Fill(ds);
        gvUserInfo.DataSource = ds;
        gvUserInfo.DataBind();
        con.Close();

    }
  
    protected void btnExport_Click(object sender, EventArgs e)
    {
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition",
         "attachment;filename=GridViewExport.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        gvUserInfo.AllowPaging = false;
        gvUserInfo.DataBind();
        gvUserInfo.RenderControl(hw);
        StringReader sr = new StringReader(sw.ToString());
        Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
        HTMLWorker htw = new HTMLWorker(pdfDoc);
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
        pdfDoc.Open();
        htw.Parse(sr);
        pdfDoc.Close();
        Response.Write(pdfDoc);
        Response.End();  
 }

 In above code you can see i used a VerifyRenderingInServerForm function. The purpose of this function is avoid the error like "control must be placed in inside of form tag". If we set VerifyRenderingInServerForm function then compiler will think that controls rendered before exporting and our functionality will work perfectly.
If you are not using this function on your page then your localhost gives you error "control must be placed in inside of form tag".
For to clear understanding about outputs refer the below screen-shots.




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