AzamSharp

Few days ago there was a question asked on www.asp.net forums that how can I export the whole GridView to Excel if the paging is enabled. I prepared this small example which shows how to achieve the task. Please note that this example is implemented in Visual Studio.NET 2005 Professional.

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Data.SqlClient;
using System.IO;

public partial class EXportTest : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindData(); 
        }

    }
    
    private string ConnectionString
    {

        get { return @"Server=localhost;Database=Northwind;
        Trusted_Connection=true"; }

    }

    

    private void BindData()
    {
        // make the query 
        string query = "SELECT * FROM Categories";
        SqlConnection myConnection = new SqlConnection(ConnectionString);
        SqlDataAdapter ad = new SqlDataAdapter(query, myConnection);
        DataSet ds = new DataSet();
        ad.Fill(ds, "Categories");
        GridView1.DataSource = ds;
        GridView1.DataBind(); 

        /* It's a good idea if you can Cache the DataSet */

    }

    public override void VerifyRenderingInServerForm(Control control)
    {

        // Confirms that an HtmlForm control is rendered for
        the specified ASP.NET server control at run time.

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Clear();

        Response.AddHeader("content-disposition",
        "attachment;filename=FileName.xls");

        Response.Charset = "";

        // If you want the option to open the Excel file without saving than

        // comment out the line below

        // Response.Cache.SetCacheability(HttpCacheability.NoCache);

        Response.ContentType = "application/vnd.xls";

        System.IO.StringWriter stringWrite = new System.IO.StringWriter();

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

        // turn off paging 
        GridView1.AllowPaging = false;
        BindData(); 
        

        GridView1.RenderControl(htmlWrite);

        Response.Write(stringWrite.ToString());

        Response.End();

        // turn the paging on again 
        GridView1.AllowPaging = true;
        BindData();
        
    }
   
    protected void GridView1_PageIndexChanging(object sender,
    GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        BindData(); 
    }
}