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Export to Excel Functionality in ASP.NET Chart Control

In my previous blog you learned how to create a chart in ASP.NET.

In Business Application reporting functionality is important. So in this blog I describe how to export to Excel from an ASP.NET Chart control.

Step 1: Create a chart control.

First follow all the steps of my previous article "How to Create Chart in ASP.NET":

http://www.c-sharpcorner.com/Blogs/8620/how-to-create-chart-in-Asp-Net.aspx
 

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

 

<%@ Register Assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"

    Namespace="System.Web.UI.DataVisualization.Charting" TagPrefix="asp" %>

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

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:Chart ID="Chart1" runat="server" Width="500px">

            <Series>

                <asp:Series Name="Education" XValueMember="State" YValueMembers="Education" IsVisibleInLegend="true">

                </asp:Series>

            </Series>

            <ChartAreas>

                <asp:ChartArea Name="ChartArea1" Area3DStyle-Enable3D="false">

                    <AxisX LineColor="DarkGray">

                        <MajorGrid LineColor="LightGray" />

                    </AxisX>

                    <AxisY LineColor="DarkGray">

                        <MajorGrid LineColor="LightGray" />

                    </AxisY>

                    <Area3DStyle Enable3D="false"></Area3DStyle>

                </asp:ChartArea>

            </ChartAreas>

            <Legends>

                <asp:Legend>

                </asp:Legend>

            </Legends>

        </asp:Chart>

    </div>

    <div>

        <asp:Button ID="btnExcel" runat="server" Text="Export To Excel" OnClick="btnExcel_Click" />

    </div>

    </form>

</body>

</html>

Step 2: Add an ASP Button control and in its click event call your .cs file as in:
 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.IO;

using System.Web.UI.HtmlControls;

using System.Web.UI.DataVisualization.Charting;

 

public partial class _Default : System.Web.UI.Page

{

    string tmpChartName = "test2.jpg";

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            CreateChart();

        }

    }

 

    private void CreateChart()

    {
        var table = new DataTable();

        table.Columns.Add("State", typeof(string));

        table.Columns.Add("Education", typeof(long));

        table.Columns.Add("Lbl");
 

        var row = table.NewRow();

        row["State"] = "Gujarat";

        row["Education"] = 791;

        table.Rows.Add(row);

 

        row = table.NewRow();

        row["State"] = "Delhi";

        row["Education"] = 978;

        table.Rows.Add(row);
 

        row = table.NewRow();

        row["State"] = "Rajasthan";

        row["Education"] = 1262;

        table.Rows.Add(row);
 

        row = table.NewRow();

        row["State"] = "Panjab";

        row["Education"] = 1650;

        table.Rows.Add(row);

 

        row = table.NewRow();

        row["State"] = "Maharastra";

        row["Education"] = 2519;

        table.Rows.Add(row);

 

        row = table.NewRow();

        row["State"] = "Madyapradesh";

        row["Education"] = 6071;

        table.Rows.Add(row);

        

        Chart1.DataSource = table;

        Chart1.DataBind();

        string imgPath = HttpContext.Current.Request.PhysicalApplicationPath + tmpChartName;
 
        Chart1.SaveImage(imgPath);
       
    }


So your output is like:

ExprtExcl.jpg

You can see that the .Net chart control creates an image. So we save the chart control as an image.

And call export to Excel.

protected void btnExcel_Click(object sender, EventArgs e)

{

 

 

        string imgPath2 = Request.Url.GetLeftPart(UriPartial.Authority) + VirtualPathUtility.ToAbsolute("~/" + tmpChartName);

        Response.Clear();

        Response.ContentType = "application/vnd.ms-excel";

        Response.AddHeader("Content-Disposition", "attachment; filename=test.xlsx;");

        StringWriter stringWrite = new StringWriter();

        HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

        string headerTable = @"<Table><tr><td><img src='" + imgPath2 + @"' \></td></tr></Table>";

        Response.Write(headerTable);

        Response.Write(stringWrite.ToString());

        Response.End();

 

    }

}


 


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