In this article I will explain with an example how to dynamically populate ASP.Net AJAX Control Toolkit Animated Bar Chart control from SQL Server Database.
![ASP.Net AJAX Control Toolkit Bar Chart Example to populate from database]()
Database
Here I am making use of Microsoft’s Northwind Database. You can download it from here
Using the ASP.Net AJAX Bar Chart control
1. Drag an ASP.Net AJAX ToolScriptManager on the page.
2. Register the AJAX Control Toolkit Library after adding reference to your project
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
HTML Markup
The HTML Markup is simple, it contains of an ASP.Net DropDownList and ASP.Net AJAX Control Toolkit Bar Chart control.
<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</cc1:ToolkitScriptManager>
<asp:DropDownList ID="ddlCountries" runat="server" OnSelectedIndexChanged="ddlCountries_SelectedIndexChanged"
AutoPostBack="true">
</asp:DropDownList>
<hr />
<cc1:BarChart ID="BarChart1" runat="server" ChartHeight="300" ChartWidth = "450"
ChartType="Column" ChartTitleColor="#0E426C" Visible = "false"
CategoryAxisLineColor="#D08AD9" ValueAxisLineColor="#D08AD9" BaseLineColor="#A156AB">
</cc1:BarChart>
Based on the selection of the DropDownList the Bar Chart will be dynamically populated from database.
Namespaces
You will need to import the following Namespaces
C#
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
VB.Net
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Populating the DropDownList and the ASP.Net AJAX Control Toolkit Bar Chart
In the Page Load event of the ASP.Net Page I have populated the DropDownList with list of Countries from the Northwind database where the Orders have been shipped.
Then on the SelectedIndexChanged event of the DropDownList I have populated the statistical information i.e. in which City of that selected country the Orders have been distributed.
This statistical information is presented as Bar Chart where Axis are the Cities of the Countries of the selected City and the series are the total amount of Orders shipped in each city.
C#
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string query = "select distinct shipcountry from orders";
DataTable dt = GetData(query);
ddlCountries.DataSource = dt;
ddlCountries.DataTextField = "shipcountry";
ddlCountries.DataValueField = "shipcountry";
ddlCountries.DataBind();
ddlCountries.Items.Insert(0, new ListItem("Select", ""));
}
}
protected void ddlCountries_SelectedIndexChanged(object sender, EventArgs e)
{
string query = string.Format("select shipcity, count(orderid) from orders where shipcountry = '{0}' group by shipcity", ddlCountries.SelectedItem.Value);
DataTable dt = GetData(query);
string[] x = new string[dt.Rows.Count];
decimal[] y = new decimal[dt.Rows.Count];
for (int i = 0; i < dt.Rows.Count; i++)
{
x[i] = dt.Rows[i][0].ToString();
y[i] = Convert.ToInt32(dt.Rows[i][1]);
}
BarChart1.Series.Add(new AjaxControlToolkit.BarChartSeries { Data = y });
BarChart1.CategoriesAxis = string.Join(",", x);
BarChart1.ChartTitle = string.Format("{0} Order Distribution", ddlCountries.SelectedItem.Value);
if (x.Length > 3)
{
BarChart1.ChartWidth = (x.Length * 100).ToString();
}
BarChart1.Visible = ddlCountries.SelectedItem.Value != "";
}
private static DataTable GetData(string query)
{
DataTable dt = new DataTable();
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand(query))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
sda.SelectCommand = cmd;
sda.Fill(dt);
}
}
return dt;
}
}
VB.Net
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Not IsPostBack Then
Dim query As String = "select distinct shipcountry from orders"
Dim dt As DataTable = GetData(query)
ddlCountries.DataSource = dt
ddlCountries.DataTextField = "shipcountry"
ddlCountries.DataValueField = "shipcountry"
ddlCountries.DataBind()
ddlCountries.Items.Insert(0, New ListItem("Select", ""))
End If
End Sub
Protected Sub ddlCountries_SelectedIndexChanged(sender As Object, e As EventArgs)
Dim query As String = String.Format("select shipcity, count(orderid) from orders where shipcountry = '{0}' group by shipcity", ddlCountries.SelectedItem.Value)
Dim dt As DataTable = GetData(query)
Dim x As String() = New String(dt.Rows.Count - 1) {}
Dim y As Decimal() = New Decimal(dt.Rows.Count - 1) {}
For i As Integer = 0 To dt.Rows.Count - 1
x(i) = dt.Rows(i)(0).ToString()
y(i) = Convert.ToInt32(dt.Rows(i)(1))
Next
BarChart1.Series.Add(New AjaxControlToolkit.BarChartSeries() With { _
.Data = y _
})
BarChart1.CategoriesAxis = String.Join(",", x)
BarChart1.ChartTitle = String.Format("{0} Order Distribution", ddlCountries.SelectedItem.Value)
If x.Length > 3 Then
BarChart1.ChartWidth = (x.Length * 100).ToString()
End If
BarChart1.Visible = ddlCountries.SelectedItem.Value <> ""
End Sub
Private Shared Function GetData(query As String) As DataTable
Dim dt As New DataTable()
Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
Using con As New SqlConnection(constr)
Using cmd As New SqlCommand(query)
Using sda As New SqlDataAdapter()
cmd.CommandType = CommandType.Text
cmd.Connection = con
sda.SelectCommand = cmd
sda.Fill(dt)
End Using
End Using
Return dt
End Using
End Function
Demo
Downloads
