Votingcontrol.net

8/12/2019 Votingcontrol.net

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This application creates a custom voting control for ASP.NET Web applications. The objective is to

encapsulate the entire functionality of voting or polling procedure inside a custom user-defined control

so that it can be reutilized across different Web applications with ease. The various steps involved in the

creation of the voting control application are:

1. Creating the Web site

2. Creating the Web user control (.ascx file)

3. Registering the control in the Web.Config file

4. Using the custom control in Default.aspx Web page

5. Running the Web site

CREATING THE WEB SITE

To create the Web site, you need to perform the following steps:

1. Open Microsoft Visual Studio and selectFileNew Web Siteto display the New Web Site

dialog box, as shown on next page:

C

Major Project:Voting Control for Asp.Net

Appendix


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464 Programming in C#

The New Web Site Dialog Box

2. Select the ASP.NET Web Siteoption under the Templatessection and enter the name of the

Web site (say VotingApp) next to the Locationfield.

3. Click OKto create the Web site. The Default.aspxpage opens with the default code, as shown

below:

The Default.aspx Page


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Appendix C: Major Project: Voting Control for Asp.Net 465

Creating the Web user control (.ascx file)

Custom Web user controls in ASP.NET are created in .ascx files and not .aspx. To create the custom

voting control, you need to perform the following steps:

1. Right-click the name of the Web site in the Solution Explorerand select the AddNew Item

option from the shortcut menu. The Add New Itemdialog box appears, as shown below:

The Add New Item Dialog Box

2. Select the Web User Controloption under the Templatessection and click Add to add a new

Web user control to the Web site, as shown below:

The WebUserControl.ascx file with Default Code


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Now, we need to add the voting or polling functionality to the newly created Web user control. Switch

to the Designmode and add the voting related controls, as shown below:

Design View of WebUserControl.ascx

Well understand the significance of each of the controls present in the WebUserControl.ascxfile

later as we continue to develop this application. The following is the source code contained in the

WebUserControl.ascxfile:

WebUserControl.ascx


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As shown in the above code, there are two buttons in our custom voting control; one for submitting

the vote while the other for viewing the voting results. To provide relevant functionality to these button

controls, we must add the corresponding C# code in their code-behind files. The following is the code

for the WebUserControl.ascx.csfile:

using System;

using System.IO;

using System.Net;using System.Data;

using System.Configuration;using System.Collections;using System.Web;

using System.Web.Security;using System.Web.UI;

using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;using System.Drawing;

public partial class WebUserControl : System.Web.UI.UserControl

{ protected void Page_Load(object sender, EventArgs e) {

Label2.Visible = false; Label3.Visible = false;

Label4.Visible = false; }

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e) {

} protected void Button1_Click(object sender, EventArgs e) {

if (Request.Cookies[State] == null) {

foreach (ListItem item in RadioButtonList1.Items) {

if (item.Selected == true) {

FileStream fs1 = new FileStream(d:\\VotingApp\\Result.txt, FileMode.Append, FileAccess.Write); StreamWriter sw1 = new StreamWriter(fs1);

sw1.WriteLine(item.Value); sw1.Flush(); sw1.Close();

fs1.Close();

HttpCookie HC = new HttpCookie(State); HC.Values[State] = Set;

HC.Expires = DateTime.Now.AddDays(2); Response.Cookies.Add(HC);

Label4.Visible = true;

Label4.ForeColor = Color.Green;


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Label4.Text = You have voted successfully!!;

}

}

}

else

{


Label4.ForeColor = Color.Red;

Label4.Text = You seem to have already voted! A voter can vote only once!!;

}

}

protected void Button2_Click(object sender, EventArgs e)

{

int yes = 0;

int no = 0;

FileStream fs2 = new FileStream(d:\\VotingApp\\Result.txt, FileMode.Open, FileAccess.Read);

StreamReader sr2 = new StreamReader(fs2); sr2.BaseStream.Seek(0, SeekOrigin.Begin);

string str = sr2.ReadLine();

while (str != null)

{

if (str == yes)

{

yes = yes + 1;

}

if (str == no)

{

no = no + 1;

} str = sr2.ReadLine();

}

sr2.Close();

fs2.Close();

float a = (float)yes / (yes + no) * 100;

int aresult = (int)a;

int bresult = 100 - aresult;


Label2.Text = Convert.ToString(aresult) + % Yes votes;


Label3.Text = Convert.ToString(bresult) + % No votes;

}}

WebUserControl.ascx.cs

In the above code, the FileStream and StreamWriter type objects are used to store the voting results

submitted by the Web user at d:\\VotingApp\\Result.txt location. The same file is later referenced

using FileStream and StreamWriter type objects to generate the overall polling results. The above code

also makes use of the HttpCookie class to add cookie support to the Web site in order to prevent users

from posting duplicate votes.


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Note: The WebUserControl.ascx file must be stored inside a subdirectory of the main Web site

directory; otherwise the compiler might generate an error at the time of building the Web site.

Registering the control in the Web.Config file

To enable the Web forms to make use of the custom control, it is required to register the control in theWeb.Configfile. To do so, open the Web.Configfile and add the following code inside it:

The above code specifies a tag prefix, tag name and the source location for the custom voting

control.

Using the custom control in the Default.aspx Web page

Now that the custom voting control is created and registered, it is time to use it in the Default.aspxpageof the Web site. Add the following code in the Default.aspxpage:

Custom Control Demo Web Site

Default.aspx

In the above code, the following statement uses the custom voting control to add voting functionality

to the Web site:


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The following figure shows the design view of the Default.aspxpage:

Design View of Default.aspx

Running the Web site

PressF5to start building the Web site; the Default.aspxWeb page appears, as shown below:

The Default.aspx Web page


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Now, select a voting option and press the Votebutton to register your vote. A voting confirmation

message appears, as shown below:

The Voting Confirmation Message

You can click the Click Here to button to view the voting results, as shown below:

Voting Results


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Now, let us try to cast another vote. Since, we had added cookie support to our Web site; it will

prevent us from casting multiple votes, as shown below:

Testing the Cookie Feature

Votingcontrol.net

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