How to Create and Consume Web Service

In this article I want to simply describe the steps how to create a web service and use it in project.

First we have to be confirmed that IIS is installed in my computer to examine this project, if not installed then it needs to be installed first. This sample project is tested in VisualStudio2005 platform.


1(Web Service Creation): First we will Create a web Service file (*.asmx) and put it into inetpub\wwwroot folder---


Name - UserInfo.asmx


<%@ WebService Language="C#" Class="UserInfo" %>


using System;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;


using System.Data;

using System.Data.SqlClient;


//[WebService(Namespace = "")]

//[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]


public class UserInfo  : System.Web.Services.WebService {



    public string HelloWorld() {

        return "Hello World";


    public DataSet ShowUsers(string str)


        SqlConnection dbConnection = new SqlConnection("server=;uid=sa;pwd=pims;database=HRFORMS;");


        SqlDataAdapter objCommand = new SqlDataAdapter("select * from USERS where Department = '" + str + "' order by Name asc", dbConnection);


        DataSet DS = new DataSet();




        return DS;



        dbConnection = null;






Here, I can change database server IP, database name and table as needs.


After creation and put it into wwwroot, We can test it initially by typing in browser - http://localhost/ UserInfo.asmx or http://localhost/ UserInfo.asmx?wsdl


2(Create proxy class file/Source file of web service): Using the following tool we will create a source class (*.cs) file.



C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin>


wsdl.exe /l:CS /n:WService /out:bin/GetUsers.cs http://localhost/UserInfo.asmx?WSDL


Note1: /l:CS – is the language you are using

Note2: /n:WService - creates the Web Service namespace so you could reference it from your .aspx page.

Note3: /out:bin/GetUsers.cs – Where and name of the class file that will be generated.


3(Create DLL from source file):. Now I will create the DLL file of GetUsers.cs file.


Run the following tool to convert class file into DLL file at command prompt)




csc /t:library /out:bin\GetUsers.dll bin\GetUsers.cs /reference:System.dll,System.Data.dll,System.Web.dll,System.Web.Services.dll,System.XML.dll /optimize


Note1: /out:bin\GetUsers.dll – location and name of DLL file that will be generated.

Note2: bin\GetUsers.cs – location and name of class file to convert into DLL file.


4(Consume web service in .aspx page ):.Now we will add DLL file(GetUsers.dll) in another web project to consume my web service earlier created.


Name - WebServiceConsume.aspx


<%@ Page Language="C#" Explicit="true" Strict="true" Buffer="true"%>

<%@ Import Namespace="System.Data" %>

<%@ Import Namespace="System.Data.SqlClient" %>

<%@ Import Namespace="WService" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="" >

<head id="Head1" runat="server">

    <title>Untitled Page</title>


<script language="C#" runat="server">


void Page_Load(Object sender, EventArgs e) { Response.Flush();}


void SubmitBtn_Click (object src, EventArgs e){


int RcdCount;

string Department = DropDown1.SelectedItem.Text;



//Instantiate DLL

WService.UserInfo  userInfo = new WService.UserInfo();



//Pass parameter into DLL function

DataSet MyData = userInfo.ShowUsers(Department);



MyDataGrid.DataSource = MyData.Tables[0].DefaultView;



RcdCount = MyData.Tables[0].Rows.Count;

if (RcdCount <= 0) {


Message.InnerHtml = "<b>No results were found for <FONT Color=Red><i>" + Department + "</i></font>";

MyDataGrid.Visible = false; //Hide Results until needed




    Message.InnerHtml = "<b><FONT Color=Red><i>" + Department + "</i></font> has " + RcdCount + " Users</b>";

MyDataGrid.Visible = true;





<body style="font: 10pt verdana">


<h4>Accessing Data with Web Services</h4>


<form id="Form1" runat="server">


<asp:DropDownList id="DropDown1" runat="server">



<asp:ListItem>Customer Service</asp:ListItem>


<asp:button ID="Button1" text="Submit" OnClick="SubmitBtn_Click" runat="server"/>


<span id="Message" runat="server"/>





<ASP:DataGrid id="MyDataGrid" runat="server"





















**(Discovering web service):.Here, we can also use disco.exe tool for discovering web service ..

1. Run this following tool at command prompt---

disco http://localhost/UserInfo.asmx?DISCO


If that web service is discovered at specific URL then it will be created a discomap file. Discomap contains the path of UserInfo.wsdl file.


Then we can run this following tool to create proxy class file as we did earlier in step2.


wsdl.exe /l:CS /n:WService /out:bin/GetUsers.cs http://localhost/UserInfo.wsdl


Then we can create DLL at next step as we did earlier in step3.


csc /t:library /out:bin\GetUsers.dll bin\GetUsers.cs /reference:System.dll,System.Data.dll,System.Web.dll,System.Web.Services.dll,System.XML.dll /optimize

Here is link of sample source code -

By Jakir Hossain   Popularity  (8309 Views)