Create A Simple Web Service In ASP.NET Using C#

Nilesh Jadav
9y
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Article

We will make a simple mathematical operation for Addition, Multiplication and Division. A web service will be created.

Initial chamber

Step 1: Open Visual Studio 2010 and create an empty website. Give a suitable name webservice_demo.

Step 2: In Solution Explorer you get your empty website, add a web form, Web Service. Here are the steps:

For Web Form

webservice_demo (Your Empty Website) - Right Click, Add New Item, then Web Form. Name it webservice_demo.aspx.

For WebService

webservice_demo (Your Empty Website) - Right Click, Add New Item, then Web Service.

Web Service

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
/// <summary>
/// Summary description for WebService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
// [System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService {
public WebService () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
public string HelloWorld() {
return "Hello World";
}
[WebMethod]
public int mul(int a, int b)
{
return a * b;
}
[WebMethod]
public int add(int a, int b)
{
return a + b;
}
[WebMethod]
public int div(int a, int b)
{
return a / b;
}
}

Design chamber

Step 3: Now open your webservice _demo.aspx file, where we create our simple design with the Textbox and a button.

webservice_demo.aspx

<%@ 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 runat="server">
<title></title>
<style type="text/css">
.style1
{
width: 301px;
}
.style3
{
width: 245px;
font-weight: bold;
}
.style4
{
width: 245px;
}
.style5
{
width: 301px;
font-weight: bold;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style="width:100%;">
<tr>
<td class="style3">
<strong>Enter Your First Number:</strong></td>
<td class="style1">
<strong>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</strong>
</td>
<td>
<strong>Your Answer:</strong></td>
</tr>
<tr>
<td class="style3">
Enter Your Second Number:</td>
<td class="style1">
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</td>
<td>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style5">
What do you want to do ??</td>
<td>
</td>
</tr>
<tr>
<td class="style4">
</td>
<td class="style1">
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Addition" />
<asp:Button ID="Button2" runat="server" onclick="Button2_Click"
Text="Multiply" />
<asp:Button ID="Button3" runat="server" Height="25px" onclick="Button3_Click"
Text="Division" />
</td>
<td>
</td>
</tr>
<tr>
<td class="style4">
</td>
<td class="style1">
</td>
<td>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

Your design looks like following image:

design

Code chamber

Step 4: Open your webservice_demo.aspx.cs and write some code so that our application starts working.

webservice_demo.aspx.cs