In this article I’m going to explain how to create google area chart with database in ASP.NET.

          Google charts provides a way to visualize data to any website. I have written many articles for Google chart visualization. Google Area chart draws the series on top of one another.

          Here I’ll show you how to create google area chart with SQL Server database. First we have to create table. Table design and sample data given below.   

Table design:

Column

datatype

id

int

year

varchar(50)

sales

varchar(10)

expences

varchar(10)

   

Sample data:

 

id

year

sales

expences

1

2000

150000

50000

2

2001

100000

30000

3

2002

200000

100000

4

2003

180000

80000

5

2004

200000

90000

6

2005

250000

200000

 

Here we’ve to use following code to load google JSAPI library

<script type="text/javascript" src="https://www.google.com/jsapi"></script>

 

Designer source code:

<%@ 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">

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

 <head>

 <title>Google Area chart</title>

    <script type="text/javascript" src="https://www.google.com/jsapi"></script>   

  </head>

<body>

    <form id="form1" runat="server">

    <div>

    <asp:Literal ID="lt" runat="server" ></asp:Literal>

   <div id="chart_div" style="width: 660px; height: 400px;"></div>

    </div>

    </form>

</body>

</html> 

 

Note:

          Here we have to use following namespace for StringBuilder class. 

using System.Text; 

 

C# code:

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.Data.SqlClient;

using System.Text;

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

{

    SqlConnection conn = new SqlConnection("Data source=localhost; Initial catalog=Demo; Integrated security=true");

    protected void Page_Load(object sender, EventArgs e)

    {

        BindChart();

    }

    private DataTable GetData()

    {

        DataTable dt = new DataTable();

        string cmd = "select * from Sales";

        SqlDataAdapter adp = new SqlDataAdapter(cmd, conn);

        adp.Fill(dt);

        return dt;

    }

    private void BindChart()

    {

        DataTable dt = new DataTable();

        StringBuilder str = new StringBuilder();

        try

        {

            dt = GetData();

 

            str.Append(@" <script type='text/javascript'>

              google.load('visualization', '1', {packages:['corechart']});

              google.setOnLoadCallback(drawChart);

              function drawChart() {

              var data = google.visualization.arrayToDataTable([['Year', 'Sales', 'Expenses'],");

 

            int count=dt.Rows.Count - 1;

            for (int i = 0; i <= count; i++)

            {

                if (count == i)

                {

                    str.Append("['" + dt.Rows[i]["year"].ToString() + "'," + dt.Rows[i]["sales"].ToString() + "," + dt.Rows[i]["expences"].ToString() + "]");

                }

                else

                {

                    str.Append("['" + dt.Rows[i]["year"].ToString() + "'," + dt.Rows[i]["sales"].ToString() + "," + dt.Rows[i]["expences"].ToString() + "],");

                }

            }

            str.Append("]);");

            str.Append(" var options = { title: 'Company Performance', hAxis: {title: 'Year',  titleTextStyle: {color: '#333'}}, vAxis: {minValue: 0} };");

            str.Append(" var chart = new google.visualization.AreaChart (document.getElementById('chart_div')); chart.draw(data, options); }");

            str.Append(" </script>");

 

            lt.Text = str.ToString();

        }

        catch (Exception ex)

        { }

    }

}

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View demo Download
http://www.dotnetfox.com/Document/1095/0Demo1.gif

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