WCF Introduction

//This is the link for Understand the End Point.
http://www.youtube.com/watch?v=GC344FZeWqc&feature=related

Windows Communication Foundation (Code named Indigo) is a programming platform and runtime system for building, configuring and deploying network-distributed services. It is the latest service oriented technology; Interoperability is the fundamental characteristics of WCF. It is unified programming model provided in .Net Framework 3.0. WCF is a combined features of Web Service, Remoting, MSMQ and COM+. WCF provides a common platform for all .NET communication.

WCF services provide better reliability and security in compared to ASMX web services.

In WCF, there is no need to make much change in code for implementing the security model and changing the binding. Small changes in the configuration will make your requirements.

WCF has integrated logging mechanism, changing the configuration file settings will provide this functionality. In other technology developer has to write the code.

EndPoint:---WCF Service is a program that exposes a collection of Endpoints. Each Endpoint is a portal for communicating with the world.

All the WCF communications are take place through end point. End point consists of three components. 1)Address 2)Binding 3)CONTRACT

1) Address:- Basically URL, specifies where this WCF service is hosted .Client will use this url to connect to the service. e.g

2) Binding:- Binding will describes how client will communicate with service. There are different protocols available for the WCF to communicate to the Client.

Simple definition for Binding describes how the client will communicate with service. We can understand with an example.

Consider a scenario say, I am creating a service that has to be used by two type of client. One of the client will access SOAP using http and other client will access Binary using TCP. How it can be done? With Web service it is very difficult to achieve, but in WCF its just we need to add extra endpoint in the configuration file.
EX:- endpoint address="http://localhost:8090/MyService/MathService.svc"
contract="IMathService"
binding="wsHttpBinding"/>
endpoint address="net.tcp://localhost:8080/MyService/MathService.svc"
contract="IMathService"
binding="netTcpBinding"/>


3)cONTRACT:- Collection of operation that specifies what the endpoint will communicate with outside world.In WCF, all services are exposed as contracts. Contract is a platform-neutral and standard way of describing what the service does. Mainly there are four types of contracts available in WCF.......

Service Contract :-Service contracts describe the operation that service can provide. For Eg, a Service provide to know the temperature of the city based on the zip code, this service is called as Service contract. It will be created using Service and Operational Contract attribute.


Data Contract :- Data contract describes the custom data type which is exposed to the client. This defines the data types, that are passed to and from service. Data types like int, string are identified by the client because it is already mention in XML schema definition language document, but custom created class or data types cannot be identified by the client e.g. Employee data type. By using DataContract we can make client to be aware of Employee data type that are returning or passing parameter to the method.


Message Contract :-Default SOAP message format is provided by the WCF runtime for communication between Client and service. If it is not meeting your requirements then we can create our own message format. This can be achieved by using Message Contract attribute.



Fault Contract :- Suppose the service I consumed is not working in the client application. I want to know the real cause of the problem. How I can know the error? For this we are having Fault Contract. Fault Contract provides documented view for error occurred in the service to client

Application Pool and Application Domain? What is the difference between the two.

1)Application pool is a grouping of URLs that is routed to one or more worker processes.

2)An application pool is a group of one or more URLs of different Web applications and Web sites. Any Web directory or virtual directory can be assigned to an application pool.
Every application within an application pool shares the same worker process executable, W3wp.exe, the worker process that services one application pool is separated from the worker
process that services another [Like starting MS Word and opening many word documents]. Each separate worker process provides a process boundary so that when an application is assigned to one application pool, problems in other application pools do not affect the application. This
ensures that if a worker process fails, it does not affect the applications running in other application pools. [i.e] for Eg., If word document is having issue it should not
logically affect your Excel Sheet isn’t it. application domain is a mechanism (similar to a process in an operating system) used to isolate executed software applications from one another so that they do not affect each other. [i.e] opening of MS WORD doesn’t affect MS EXCEL
you can open and close both the applications any time since there is no dependency between the applications. Each application domain has its own virtual address space which scopes the resources for the application domain using that address space.

sql server funcation Return Table (User Defined Function)

create function fun(@id int)
returns table
as
return (select name from students where id=@id)


//How to use in sql server
select * from master.dbo.fun(1);

////how to use in asp.net

con.open();
SqlCommand cmd = new SqlCommand("select name from schools.dbo.fun(3)", con);
SqlDataReader dr2 = cmd.ExecuteReader();

if (dr2.HasRows)
{
while (dr2.Read())
{
string s= dr2.GetString(0);
}
}
con.close();



///another Function return string

CREATE FUNCTION GetFullName()
RETURNS varchar(100)
AS
BEGIN
RETURN 'Doe, John'
END

//how to use function in sql server

PRINT Schools.dbo.GetFullName();

sql server DataBase Reference(Help)

http://www.functionx.com/sqlserver/index.htm

Ajax Help for Designing any pages(Source Code)

www.dynamicdrive.com/

//download ajax .dll(AjaxControlToolkit.dll) and Add it into your project....

after that add the @Register directive: @Register Directive use for informs the compiler of any custom server control add to the page..

%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>

after that use the Reference Link " www.dynamicdrive.com/ "

HTML REPORT and Print the Html Report

//Take one Input Button for Print

input type="button" id="btnPrint" runat="server" value ="Print" onclick ="PrintReport();"/>

//Make one method for print

script type="text/javascript" language="javascript" >
function PrintReport() {
var bt = document.getElementById("btnPrint").style.display='block';
window.print()

}
/script>

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{ con.open();
SqlCommand cmd = new SqlCommand("select * from students", con);
SqlDataReader oDr = cmd.ExecuteReader();
if (oDr.HasRows)
{
StringBuilder sb = new StringBuilder();
sb.Append(""); sb.Append(""); sb.Append(""); sb.Append(""); sb.Append(""); // get your data while (oDr.Read()) { sb.Append(""); sb.Append(""); sb.Append(""); } sb.Append("

	Financial Report
"); sb.Append("id".ToString()); sb.Append("	"); sb.Append("Name".ToString()); sb.Append("	"); sb.Append("Roll".ToString()); // finish the rest of the row sb.Append("
"); sb.Append(oDr["id"].ToString()); sb.Append("	"); sb.Append(oDr["Name"].ToString()); sb.Append("	"); sb.Append(oDr["Roll"].ToString()); // finish the rest of the row sb.Append("

");
Response.Write(sb);
con.close();
}

}



}

Three Tier Insert and Retrieve Data(Using Singleton for SqlConnection only)

Application layer(PL) :- is the form where we design using the controls like textbox, labels, command buttons etc.

Business layer(BAL) :- is the class where we write the functions which get the data from the application layer and passes through the data access layer.BAL contains business logic, validations or calculations related with the data, if needed.

Data layer(DAL) :- is also the class which gets the data from the business layer and sends it to the database or gets the data from the database and sends it to the business layer.

Property layer(BE) :- is the sub layer of the business layer in which we make the properties to sent or get the values from the application layer. These properties help to sustain the value in a object so that we can get these values till the object destroy.

////// SQL HELPER CLASS(Inside the DAL Make sql Helper class) for connection string........

public class sqlHelper
{
private static SqlConnection connection = null;
public static SqlConnection conn
{
get
{
if (connection == null)
{
connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SchoolsConnectionString"].ConnectionString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}

return connection;
}
}

public static void closeconn(SqlConnection connection)
{
if (connection.State == System.Data.ConnectionState.Open)
{
connection.Close();
}

}
}

///////// DAL(Data Access Layer) CLASS LIBRARY..............

Using BE; //ADD REFERENCE OF BE

public class DAL
{
public int InsertDal(BE.BE obBe)
{
try
{
SqlCommand cmd = new SqlCommand("Insert_Student", sqlHelper.conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("Name", obBe.Name);
cmd.Parameters.AddWithValue("Roll", obBe.Roll);
return cmd.ExecuteNonQuery();
}
catch
{
sqlHelper.closeconn(sqlHelper.conn);
throw;
}
finally
{
sqlHelper.closeconn(sqlHelper.conn);

}


}

public DataSet BindDal()
{
try
{
SqlCommand cmd = new SqlCommand("Bind", sqlHelper.conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter adp = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
adp.Fill(ds);
return ds;
}
catch
{
sqlHelper.closeconn(sqlHelper.conn);
throw;
}
finally
{
sqlHelper.closeconn(sqlHelper.conn);
}
}
}


/////////// BAL(Business Access Layer) CLASS LIBRARY....................
Using DAL;
Using BE;

public class BAL
{
DAL.DAL obDal = new DAL.DAL();
public int InsertBal(BE.BE obBe)
{
try
{
return obDal.InsertDal(obBe);
}
catch { throw; }
}

public DataSet BindBal()
{
try
{
return obDal.BindDal();

}
catch { throw; }

}
}

////// BE(Business Entity) CLASS LIBRARY.............(Property)

public class BE
{
private int _Id;
private string _Name = string.Empty;
private int _roll;

public int Id
{
get { return _Id; }
set { _Id = value; }
}
public string Name
{
get { return _Name; }
set { _Name = value; }
}
public int Roll
{
get { return _roll; }
set { _roll = value; }
}
}

/////////// PL(Persentation Layer).aspx Page
using BE;
using BAL;

BAL.BAL OBbAL = new BAL.BAL ();
BE.BE obBe = new BE.BE();
//Retrieve the value
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

GridView1.DataSource = OBbAL.BindBal();
GridView1.DataBind();
}
}
//Insert the value
protected void btnInsert_Click(object sender, EventArgs e)
{
obBe.Name =TextBox1.Text.Trim().Replace(",","''");
obBe.Roll =Convert.ToInt32(TextBox2.Text.Trim().Replace(",","''"));
OBbAL.InsertBal(obBe);
TextBox1.Text = "";
TextBox2.Text = "";
}