Background
Sometimes we need to show data in a chart like a Pie chart, such as to show quarterly data and on, so by considering the preceding requirement and to introduce the ASP.Net Pie Chart controls I have decided to write this article.
Let us learn about the ASP.Net chart type Pie chart that provides a powerful UI and design quality. We will learn about these chart type controls step-by-step. All the charts are in the System.Web.UI.DataVisualization.Charting namespace.
Chart data is represented using the following points:
- X Axis: the horizontal line of the chart termed the X axis
- Y Axis: the vertical line of the chart termed the Y axis
Now let us learn about the properties of the Pie chart. A Pie chart type has the following common properties:
- AlternetText: Sets the alternate text when the image is not available
- Annotation: Stores the chart annotations
- AntiAliasing: sets a value that determines whether anti-aliasing is used when text and graphics are drawn
- BackGradientStyle: sets the orientation for the background gradient for the Chart control. Also determines whether a gradient is used, the default is None
- Backcolor: sets the background color for a chart, the default color is White
- BackImage: sets the background image for the chart control.
- BackHatchStyle: sets the hatching style for the chart control, the default is None.
- Height: Sets the height for the chart control
- Width: Sets the width for the chart control
- Palette: Sets the style with the color for the chart control, the default style is Chocolate.
- PaletteCustomColors: Sets the custom color for the chart control.
- Series: Sets the series collection for the chart control
- Legends: Sets the series of legends to the chart
Now let us show the preceding explanation with a practical example by creating a simple web application.
Step 1: Create the table for the chart data
Now before creating the application, let us create a table named QuarterwiseSale in a database from where we show the records in the chart using the following script:
- CREATE TABLE [dbo].[QuarterwiseSale](
- [id] [int] IDENTITY(1,1) NOT NULL,
- [Quarter] [varchar](50) NULL,
- [SalesValue] [money] NULL,
- CONSTRAINT [PK_QuarterwiseSale] PRIMARY KEY CLUSTERED
- (
- [id] ASC
- )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
- ) ON [PRIMARY]
The table has the following fields (shown in the following image):
Now insert some records using the following script:
- SET IDENTITY_INSERT [dbo].[QuarterwiseSale] ON
-
- GO
- INSERT [dbo].[QuarterwiseSale] ([id], [Quarter], [SalesValue]) VALUES (1, N'Q1', 100.0000)
- GO
- INSERT [dbo].[QuarterwiseSale] ([id], [Quarter], [SalesValue]) VALUES (2, N'Q2', 50.0000)
- GO
- INSERT [dbo].[QuarterwiseSale] ([id], [Quarter], [SalesValue]) VALUES (3, N'Q3', 150.0000)
- GO
- INSERT [dbo].[QuarterwiseSale] ([id], [Quarter], [SalesValue]) VALUES (4, N'Q4', 200.0000)
- GO
- SET IDENTITY_INSERT [dbo].[QuarterwiseSale] OFF
- GO
Now the records will look as in the list in the following image:
Now create the Stored Procedure to fetch the records from database as in the following:
- Create Procedure [dbo].[GetSaleData]
- (
- @id int=null
-
-
- )
- as
- begin
- Select Quarter,SalesValue from QuarterwiseSale
- End
I hope you have the same type of table and records as above.
Step: 2 Create Web Application
Now create the project using the following:
- "Start" - "All Programs" - "Microsoft Visual Studio 2010".
- "File" - "New Project" - "C#" - "Empty Project" (to avoid adding a master page).
- Provide the project a name such as UsingPieChart or another as you wish and specify the location.
- Then right-click on Solution Explorer and select "Add New Item" then select Default.aspx page.
- Drag and Drop a Chart control from the ToolBox onto the Default.aspx page.
Now the Default.aspx source code will be as follows:
- <%@ 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>Article by Vithal Wadje</title>
- </head>
- <body bgcolor="Navy">
- <form id="form1" runat="server">
- <h4 style="color: White;">
- Article for C#Corner
- </h4>
- <asp:Chart ID="Chart1" runat="server" BackColor="0, 0, 64" BackGradientStyle="LeftRight"
- BorderlineWidth="0" Height="360px" Palette="None" PaletteCustomColors="Maroon"
- Width="380px" BorderlineColor="64, 0, 64">
- <Titles>
- <asp:Title ShadowOffset="10" Name="Items" />
- </Titles>
- <Legends>
- <asp:Legend Alignment="Center" Docking="Bottom" IsTextAutoFit="False" Name="Default"
- LegendStyle="Row" />
- </Legends>
- <Series>
- <asp:Series Name="Default" />
- </Series>
- <ChartAreas>
- <asp:ChartArea Name="ChartArea1" BorderWidth="0" />
- </ChartAreas>
- </asp:Chart>
- </form>
- </body>
- </html>
Create a method to bind the chart control. Then open the default.aspx.cs page and create the following function named Bindchart to bind the Chart Control as in the following:
- private void Bindchart()
- {
- connection();
- com = new SqlCommand("GetSaleData", con);
- com.CommandType = CommandType.StoredProcedure;
- SqlDataAdapter da = new SqlDataAdapter(com);
- DataSet ds = new DataSet();
- da.Fill(ds);
-
- DataTable ChartData = ds.Tables[0];
-
-
- string[] XPointMember = new string[ChartData.Rows.Count];
- int[] YPointMember = new int[ChartData.Rows.Count];
-
- for (int count = 0; count < ChartData.Rows.Count; count++)
- {
-
- XPointMember[count] = ChartData.Rows[count]["Quarter"].ToString();
-
- YPointMember[count] = Convert.ToInt32(ChartData.Rows[count]["SalesValue"]);
-
- }
-
- Chart1.Series[0].Points.DataBindXY(XPointMember, YPointMember);
-
-
- Chart1.Series[0].BorderWidth = 10;
-
- Chart1.Series[0].ChartType = SeriesChartType.Pie;
-
-
- foreach (Series charts in Chart1.Series)
- {
- foreach (DataPoint point in charts.Points)
- {
- switch (point.AxisLabel)
- {
- case "Q1": point.Color = Color.RoyalBlue; break;
- case "Q2": point.Color = Color.SaddleBrown; break;
- case "Q3": point.Color = Color.SpringGreen; break;
- }
- point.Label = string.Format("{0:0} - {1}", point.YValues[0], point.AxisLabel);
-
- }
- }
-
-
-
-
- con.Close();
-
- }
Note that we have written a small code snippet to give the different color for each point as in the following:
-
-
- foreach (Series charts in Chart1.Series)
- {
- foreach (DataPoint point in charts.Points)
- {
- switch (point.AxisLabel)
- {
- case "Q1": point.Color = Color.RoyalBlue; break;
- case "Q2": point.Color = Color.SaddleBrown; break;
- case "Q3": point.Color = Color.SpringGreen; break;
- }
- point.Label = string.Format("{0:0} - {1}", point.YValues[0], point.AxisLabel);
-
- }
- }
Now, call the preceding function on page load as in the following:
- protected void Page_Load(object sender, EventArgs e)
- {
- if (!IsPostBack)
- {
- Bindchart();
-
- }
- }
The entire code of the default.aspx.cs page will look as follows:
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Web;
- using System.Web.UI;
- using System.Web.UI.WebControls;
- using System.Data.SqlClient;
- using System.Configuration;
- using System.Data;
- using System.Web.UI.DataVisualization.Charting;
- using System.Drawing;
-
- public partial class _Default : System.Web.UI.Page
- {
- private SqlConnection con;
- private SqlCommand com;
- private string constr, query;
- private void connection()
- {
- constr = ConfigurationManager.ConnectionStrings["getconn"].ToString();
- con = new SqlConnection(constr);
- con.Open();
-
- }
- protected void Page_Load(object sender, EventArgs e)
- {
- if (!IsPostBack)
- {
- Bindchart();
-
- }
- }
-
-
- private void Bindchart()
- {
- connection();
- com = new SqlCommand("GetSaleData", con);
- com.CommandType = CommandType.StoredProcedure;
- SqlDataAdapter da = new SqlDataAdapter(com);
- DataSet ds = new DataSet();
- da.Fill(ds);
-
- DataTable ChartData = ds.Tables[0];
-
-
- string[] XPointMember = new string[ChartData.Rows.Count];
- int[] YPointMember = new int[ChartData.Rows.Count];
-
- for (int count = 0; count < ChartData.Rows.Count; count++)
- {
-
- XPointMember[count] = ChartData.Rows[count]["Quarter"].ToString();
-
- YPointMember[count] = Convert.ToInt32(ChartData.Rows[count]["SalesValue"]);
-
- }
-
- Chart1.Series[0].Points.DataBindXY(XPointMember, YPointMember);
-
-
- Chart1.Series[0].BorderWidth = 10;
-
- Chart1.Series[0].ChartType = SeriesChartType.Pie;
-
-
- foreach (Series charts in Chart1.Series)
- {
- foreach (DataPoint point in charts.Points)
- {
- switch (point.AxisLabel)
- {
- case "Q1": point.Color = Color.RoyalBlue; break;
- case "Q2": point.Color = Color.SaddleBrown; break;
- case "Q3": point.Color = Color.SpringGreen; break;
- }
- point.Label = string.Format("{0:0} - {1}", point.YValues[0], point.AxisLabel);
-
- }
- }
-
-
-
-
- con.Close();
-
- }
- }
We now have the entire logic to bind the chart from the database, let us run the application. The chart will look as follows:
Now let us change the Point color as:
- foreach (Series charts in Chart1.Series)
- {
- foreach (DataPoint point in charts.Points)
- {
- switch (point.AxisLabel)
- {
- case "Q1": point.Color = Color.YellowGreen; break;
- case "Q2": point.Color = Color.Yellow; break;
- case "Q3": point.Color = Color.SpringGreen; break;
- }
- point.Label = string.Format("{0:0} - {1}", point.YValues[0], point.AxisLabel);
-
- }
- }
Now the chart will look as follows:
In the preceding chart we saw how the data is properly arranged with the user interactive graphics, now let us set the 3D style enabled as in the following:
- Chart1.ChartAreas["ChartArea1"].Area3DStyle.Enable3D = true;
Now the chart will look as follows:
Now change the Border width as:
-
- Chart1.Series[0].BorderWidth = 4;
Now the chart will look as follows:
Now from all the preceding explanations we saw how to create and use a Pie type chart.
Notes
- Download the Zip file from the attachment for the full source code of the application.
- Change the connection string in the web.config file to specify your server location.
Summary
My next article explains another chart type of ASP.Net. I hope this article is useful for all readers, if you have any suggestion then please contact me including beginners also.