Friday 20 January 2012

3 tier Architecture of ASP.NET

The configuration of ASP.NET is managed by information stored in XML-format in a configuration file (Web.Config).
The cache allows for improved performance of ASP.NET, as the most commonly requested pages would be served from
the ASP.NET cache.State management services for ASP.NET are provided by the ASP.NET state service.
The .NET Framework provides the Common Language Runtime (CLR) , which compiles and manages the execution of ASP.NET
code, and the class libraries, which offer prebuilt programmatic functionality for Web Forms, XML support, and exception handling.
ADO.NET provides ASP.NET with connections to databases.

3-Tier Architecture in ASP.NET with C#

3-Tier architecture generally contains UI or Presentation Layer, Business Access Layer (BAL) or Business Logic Layer and Data Access Layer (DAL).

Presentation Layer (UI)
Presentation layer contains pages like .aspx or windows form where data is presented to the user or input is taken from the user.

Business Access Layer (BAL) or Business Logic Layer
BAL contains business logic, validations or calculations related with the data..

Data Access Layer (DAL)
DAL contains methods that helps business layer to connect the data and perform required action, might be returning data or manipulating

data (insert, update, delete etc).

Designing 3-Tier Architecture

Data Access Layer (DAL) Code

Code for Data Access Layer


using System;

using System.Data;

using System.Configuration;

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.Data.OleDb;


public class PersonDAL
{
    
  string connStr = ConfigurationManager.ConnectionStrings["connectionstring"].ToString();
    public PersonDAL()
    {
   }
    
    public int Insert(string name, string address, int age)
    {

        OleDbConnection conn = new OleDbConnection(connStr);

        conn.Open();

  OleDbCommand dCmd = new OleDbCommand("insert into insertrecord values(@P,@q,@r)",conn);
        try
        {
            dCmd.Parameters.AddWithValue("@p", name);
            dCmd.Parameters.AddWithValue("@q", address);
            dCmd.Parameters.AddWithValue("@r", age);
            return dCmd.ExecuteNonQuery();

        }

        catch
        {

            throw;

        }

        finally
        {

            dCmd.Dispose();

            conn.Close();

            conn.Dispose();

        }

    }
    }

Code for .cs file


using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //Lets validate the page first

        if (!Page.IsValid)

            return;

        int intResult = 0;

        PersonBAL pBAL = new PersonBAL();

       // Instantiate the object we have to deal with

        string name = txtname.Text;
        string address = txtaddress.Text;
        int age = Int32.Parse(txtAge.Text);
        try
        {
           intResult = pBAL.Insert(name, address, age);
            if (intResult > 0)

               lblMessage.Text = "New record inserted successfully.";

            else

   lblMessage.Text = "FirstName [<b>" + txtname.Text + "</b>]

                      alredy exists, try another name";

        }
        catch (Exception ee)
        {

            lblMessage.Text = ee.Message.ToString();

        }

        finally
        {

            pBAL = null;

        }        
    }
}

Presentation Layer

Code for .aspx page


<%@ 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>Untitled Page</title>
    <style type="text/css">
        .style1
        {
            width: 100%;
            height: 215px;
            background-color: #FFFFCC;
        }
        .style2
        {
            width: 271px;
        }
        .style3
        {
            width: 271px;
            height: 44px;
        }
        .style4
        {
            height: 44px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div style="background-color: #008000; height: 253px;">
    
        <table class="style1">
            <tr>
                <td colspan="2">
                                      ADD RECORDS&nbsp;</td>
            </tr>
            <tr>
                <td class="style2">
                    &nbsp;&nbsp;&nbsp;&nbsp;Name</td>
                <td>
                    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td class="style2">
                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp&nbsp; 
                    Address&nbsp;</td>
                <td>
                    <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td class="style3">
                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Age&nbsp;</td>
                <td class="style4">
                    <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td class="style2">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <td>
                    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" 
                        Text="Save Record" />
                </td>
            </tr>
            <tr>
                <td class="style2">
                    &nbsp;</td>
                <td>
                    &nbsp;</td>
            </tr>
        </table>   
    </div>
    </form>
</body>
</html>

Friday 20 January 2012

3 tier Architecture of ASP.NET

3-Tier Architecture in ASP.NET with C#

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