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

          A bubble chart is used to visualize a data set with two to four dimensions. The first two dimensions are visualized as coordinates, the third as color and the fourth as size.

In this demo I have used to create bubble chart for Correlation between life expectancy, fertility rate and population of some worldcountries (2010)

First we have to create table. Table design and sample data given below.   

Table design:

Column

Datatype

ID

varchar(10)

Life_Expectancy

float

Fertility_Rate

float

Region

varchar(10)

Population

bigint

   

Sample data:

 

ID

Life_Expectancy

Fertility_Rate

Region

Population

CAN

80.66

1.67

North America

33739900

DEU

79.84

1.36

Europe

81902307

DNK

78.6

1.84

Europe

5523095

EGY

72.73

2.78

Middle East

79716203

GBR

80.05

2

Europe

61801570

IRN

72.49

1.7

Middle East

73137148

 

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>Bubble 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: 900px; height: 500px;"></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 DemoTbl";

        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([['ID', 'Life_Expectancy', 'Fertility_Rate', 'Region', 'Population'],");

 

            int count=dt.Rows.Count - 1;

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

            {

                if (count == i)

                {

                    str.Append("['" + dt.Rows[i]["ID"].ToString() + "'," + dt.Rows[i]["Life_Expectancy"].ToString() + "," + dt.Rows[i]["Fertility_Rate"].ToString() + ",'" + dt.Rows[i]["Region"].ToString() + "'," + dt.Rows[i]["Population"].ToString() + "]");

                }

                else

                {

                    str.Append("['" + dt.Rows[i]["ID"].ToString() + "'," + dt.Rows[i]["Life_Expectancy"].ToString() + "," + dt.Rows[i]["Fertility_Rate"].ToString() + ",'" + dt.Rows[i]["Region"].ToString() + "'," + dt.Rows[i]["Population"].ToString() + "],");

                }

            }

            str.Append("]);");

            str.Append(" var options = {title: 'Correlation between life expectancy, fertility rate and population of some world countries (2010)', hAxis: {title: 'Life Expectancy'},");

            str.Append(" vAxis: {title: 'Fertility Rate'}, bubble: {textStyle: {fontSize: 11}}};");

            str.Append(" var chart = new google.visualization.BubbleChart(document.getElementById('chart_div')); chart.draw(data, options); } </script>");

 

            lt.Text = str.ToString();

        }

        catch (Exception ex)

        {

        }

    }

}

 

For more details about bubble chart and its properties please refer following link.

https://developers.google.com/chart/interactive/docs/gallery/bubblechart

 

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View demo Download
http://www.dotnetfox.com/Document/1093/0Demo1.gif

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