DOTNET POINT: how to consume (or) use wcf service in web application | how to consume (or) use wcf service in asp.net

Introduction:

Here I will explain how to use or consume WCF (windows communication foundation) service in web application using asp.net.

Description:

In previous articles explained clearly what WCF (windows communication foundation) is and how to create and consume WCF service in c#(windows application) and I also explained clearly uses of WCF Service. Now in this article I will explain how to consume WCF service in web application.

Creating simple application using WCF

Here I am going to do WCF sample to insert new userdetails and display Userdetails based on UserName for that first create table in your database like this

Column Name	Data Type	Allow Nulls
UserId	Int(Set Identity=true)	No
UserName	nvarchar(MAX)	Yes
FirstName	varchar(50)	Yes
LastName	varchar(50)	Yes
Location	varchar(50)	Yes

After that First open Visual Studio and click file ---> Select New ---> Website Under that select WCF Service and give name for WCF Service and click OK

Once you created application you will get default class files including Service.cs and IService.cs

Here IService.cs is an interface it does contain Service contracts and Data Contracts and Service.cs is a normal class inherited by IService where you can all the methods and other stuff.

Now open IService.cs add the following namespaces

using System.Collections.Generic;

using System.Runtime.Serialization;

using System.ServiceModel;

After that write the following code in IService.cs file

[ServiceContract]

public interface IService

{

[OperationContract]

List<UserDetails> GetUserDetails(string Username);

[OperationContract]

string InsertUserDetails(UserDetails userInfo);

}

// Use a data contract as illustrated in the sample below to add composite types to service operations.

[DataContract]

public class UserDetails

{

string username = string.Empty;

string firstname = string.Empty;

string lastname = string.Empty;

string location = string.Empty;

[DataMember]

public string UserName

{

get { return username; }

set { username = value; }

}

[DataMember]

public string FirstName

{

get { return firstname; }

set { firstname = value; }

}

[DataMember]

public string LastName

{

get { return lastname; }

set { lastname = value; }

}

[DataMember]

public string Location

{

get { return location; }

set { location = value; }

}

After that open Service.cs class file and add the following namespaces

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

After that write the following code

public class Service : IService

{

private string strConnection = ConfigurationManager.ConnectionStrings["dbconnection"].ToString();

public List<UserDetails> GetUserDetails(string Username)

{

List<UserDetails> userdetails = new List<UserDetails>();

using (SqlConnection con=new SqlConnection(strConnection))

{

con.Open();

SqlCommand cmd = new SqlCommand("select * from UserInformation where UserName Like '%'+@Name+'%'", con);

cmd.Parameters.AddWithValue("@Name", Username);

SqlDataAdapter da = new SqlDataAdapter(cmd);

DataTable dtresult = new DataTable();

da.Fill(dtresult);

if(dtresult.Rows.Count>0)

{

for(int i=0;i<dtresult.Rows.Count;i++)

{

UserDetails userInfo = new UserDetails();

userInfo.UserName = dtresult.Rows[i]["UserName"].ToString();

userInfo.FirstName = dtresult.Rows[i]["FirstName"].ToString();

userInfo.LastName = dtresult.Rows[i]["LastName"].ToString();

userInfo.Location = dtresult.Rows[i]["Location"].ToString();

userdetails.Add(userInfo);

}

con.Close();

}

return userdetails;

}

public string InsertUserDetails(UserDetails userInfo)

{

string strMessage = string.Empty;

using (SqlConnection con=new SqlConnection(strConnection))

{

con.Open();

SqlCommand cmd = new SqlCommand("insert into UserInformation(UserName,FirstName,LastName,Location) values(@Name,@FName,@LName,@Location)", con);

cmd.Parameters.AddWithValue("@Name", userInfo.UserName);

cmd.Parameters.AddWithValue("@FName", userInfo.FirstName);

cmd.Parameters.AddWithValue("@LName", userInfo.LastName);

cmd.Parameters.AddWithValue("@Location", userInfo.Location);

int result= cmd.ExecuteNonQuery();

if(result==1)

{

strMessage = userInfo.UserName+ " Details inserted successfully";

}

else

{

strMessage = userInfo.UserName + " Details not inserted successfully";

}

con.Close();

}

return strMessage;

}

Now set the database connection string in web.config file because in above I am getting the connection string from web.config file

</connectionStrings>

Our WCF service ready to use with basicHttpBinding. Now we can call this WCF Service method console applications

After completion of WCF service creation publish or deploy your WCF Service in your system. If you don’t’ have idea on deploy check this post publish or deploy website

After completion of deploy webservice now we can see how to use WCF Service in our console application

Calling WCF Service using Web Application

To call WCF service we have many ways like using console app, windows app and web app in previous post I explained how to call (or) consume WCF service in console application. Now I will explain how to consume WCF service in web application.

Create new website from visual studio select New---> Website and give some name as you like.

After Creation Website now we need to add WCF reference to our web application for that right click on your web application and select Add Service Reference

Now one wizard will open in that give your WCF service link and click Go after add your service click OK button.

After completion of adding WCF Service first open Default.aspx page and write the following code

<title>Untitled Page</title>

.style1 {

height: 26px;

}

</style>

</head>

<body>

<div>

<tr>

<b>User Registration</b>

</td>

</tr>

<tr>

<td>

UserName:

</td>

<td>

<asp:TextBox ID="txtUserName" runat="server"/>

</td>

</tr>

<tr>

<td>

FirstName:

</td>

<td>

<asp:TextBox ID="txtfname" runat="server"/>

</td>

</tr>

<tr>

<td>

LastName:

</td>

<td>

<asp:TextBox ID="txtlname" runat="server"/>

</td>

</tr>

<tr>

Location:

</td>

<asp:TextBox ID="txtlocation" runat="server"/>

</td>

</tr>

<tr>

<td>

</td>

<td>

<asp:Button ID="btnSubmit" runat="server" Text="Submit" onclick="btnSubmit_Click" />

</td>

</tr>

<tr>

<asp:Label ID="lblResult" runat="server"/>

</td>

</tr>

<tr>

<asp:GridView runat="server" ID="gvDetails" AutoGenerateColumns="false">

<asp:BoundField HeaderText="UserName" DataField="UserName" />

<asp:BoundField HeaderText="FirstName" DataField="FirstName" />

<asp:BoundField HeaderText="LastName" DataField="LastName" />

<asp:BoundField HeaderText="Location" DataField="Location" />

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</div>

</form>

</body>

</html>

Now open Default.aspx.cs file and add following namespaces

using System;

using System.Collections.Generic;

using ServiceReference1;

After adding namespaces write the following code in codebehind

ServiceReference1.ServiceClient objService = new ServiceClient();

protected void Page_Load(object sender, EventArgs e)

{

if(!IsPostBack)

{

BindUserDetails();

}

protected void BindUserDetails()

{

IList<UserDetails> objUserDetails = new List<UserDetails>();

objUserDetails = objService.GetUserDetails("");

gvDetails.DataSource = objUserDetails;

gvDetails.DataBind();

}

protected void btnSubmit_Click(object sender, EventArgs e)

{

UserDetails userInfo = new UserDetails();

userInfo.UserName = txtUserName.Text;

userInfo.FirstName = txtfname.Text;

userInfo.LastName = txtlname.Text;

userInfo.Location = txtlocation.Text;

string result= objService.InsertUserDetails(userInfo);

lblResult.Text = result;

BindUserDetails();

txtUserName.Text = string.Empty;

txtfname.Text = string.Empty;

txtlname.Text = string.Empty;

txtlocation.Text = string.Empty;

}

After completion of adding code check your endpoint connection for WCF Service reference that should be like this

<endpoint address=" http://localhost/WCFServiceSample/Service.svc"

binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IService"

contract="ServiceReference1.IService" name="WSHttpBinding_IService">

</identity>

</endpoint>

Now everything is ready run your application that output should be like this

DOTNET POINT

Thursday, 23 February 2012

how to consume (or) use wcf service in web application | how to consume (or) use wcf service in asp.net | wcf tutorial with examples for beginners

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