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Client/Server Model
Applications may vary from single-tier desktop applications          (applications that follow the single-tier
architecture) to multi-tier applications (applications that follow the two-, three-,         or         n-tier
architecture).Based on the processing scenario, a business application can have the following elements:
     The User Interface or the presentation elements through which data is entered.
     The application logic or the business rule element, which helps in validating the entered data.
     The data storage or the data management element, which manages the storage and retrieval of data.

These elements form the base of the models or architectures used in application development. All these
elements can exist on the same computer as a single process or on different computers as different
processes. Depending on the placement of these elements the application architecture can be categorized
as:

    1.   Single-tier architecture
    2.   Two-tier architecture
    3.   Three-tier architecture
    4.   N-tier architecture

    1. Single-tier architecture
A single executable file handles all functions relating to the user, business, and data service layers. All
elements of a business application are combined as a single process. If multiple users need to work on this
application then it needs to be installed on the computer of every user. This type of architecture has one
disadvantage. In case some errors are identified in the application then after rectifying the same, the
application has to be installed again on the system of every user. This is time-consuming process.




                                    Figure 1.0 Single-tier architecture

    2. Two-tier architecture
In two tier architecture, the application is divided in to two parts. One part handles data, while the other
provides the user interface. Therefore, this architecture is called two-tier architecture. The part that handles
the UI is called the client tier. The part that implements the application logic and validates the input data
based on the business rules is called the Server tier, as shown in the following figure.




                                    Figure 1.1 Two-tier architecture
In this architecture, the mainteanance, upgrade and general administration of data is easier, as it exists only
on the server and not on all the clients.Two tier architecture is called the client server architecture. A client
sends the request for services and a server provides the service. Most RDBMS, such as Microsoft Access,
SQL Server, and Oracle, support client-server architecture. RDBMS provides centralized functionality
while supporting many users.
3. Three-tier architecture
When implementing complex business solutions in two-tier architecture, the tier on which the business
logic is implemented becomes over loaded. As a result, it takes more time to execute. Therefore, to provide
further flexibility, the two-tier architecture can be split into three tiers. In three tier architecture, the first
tier is the client tier. The second or the middle tier is called the business tier. The third tier is called the
Server tier. The server tier contains a database server that manages the data. All the three service layers
reside separately, either on the same machine or on different machines. In this architecture, an additional
tier called a business tier has been added between the client tier and the server tier, as shown in the
following figure.




                                   Figure 1.2 Three-tier architecture

The business tier consists of all the business rules. It consists of the application logic that implements
business rules and validates the data. The advantage of a three tier application is that it allows you to change
the business rules without affecting the other two tiers.

    4. N-tier architecture
As the business complexities increased, the business tier became larger and unmanageable. This led to the
evolution of n-tier architecture, where the business services model was divided into smaller manageable
units. N-tier is also called multi tier architecture. In this architecture, one components near the client tier is
responsible to do the client side validation and send the data to the presentation tier. Therefore, it is possible
to keep the UI-centric processing component on a computer near the client. The UI-centric processing
component is responsible for processing the data received from and sent to the presentation tier. Data-
centric processing components are responsible for accessing the data tier to retrieve, modify, and delete
data to and from the database server.The N-tier architecture consists of the following layers:

       Client tier
       UI-Centric processing components
       Data-Centric processing object
       Database Server

Applications that follow multi tier can be used across various locations. For example, in Web application,
an application is stored on the Web server. The clients access the applications from any location through
a browser. The clients make requests to the web server and receive responses.

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Client server architecture in .net by varun tiwari

  • 1. Client/Server Model Applications may vary from single-tier desktop applications (applications that follow the single-tier architecture) to multi-tier applications (applications that follow the two-, three-, or n-tier architecture).Based on the processing scenario, a business application can have the following elements:  The User Interface or the presentation elements through which data is entered.  The application logic or the business rule element, which helps in validating the entered data.  The data storage or the data management element, which manages the storage and retrieval of data. These elements form the base of the models or architectures used in application development. All these elements can exist on the same computer as a single process or on different computers as different processes. Depending on the placement of these elements the application architecture can be categorized as: 1. Single-tier architecture 2. Two-tier architecture 3. Three-tier architecture 4. N-tier architecture 1. Single-tier architecture A single executable file handles all functions relating to the user, business, and data service layers. All elements of a business application are combined as a single process. If multiple users need to work on this application then it needs to be installed on the computer of every user. This type of architecture has one disadvantage. In case some errors are identified in the application then after rectifying the same, the application has to be installed again on the system of every user. This is time-consuming process. Figure 1.0 Single-tier architecture 2. Two-tier architecture In two tier architecture, the application is divided in to two parts. One part handles data, while the other provides the user interface. Therefore, this architecture is called two-tier architecture. The part that handles the UI is called the client tier. The part that implements the application logic and validates the input data based on the business rules is called the Server tier, as shown in the following figure. Figure 1.1 Two-tier architecture In this architecture, the mainteanance, upgrade and general administration of data is easier, as it exists only on the server and not on all the clients.Two tier architecture is called the client server architecture. A client sends the request for services and a server provides the service. Most RDBMS, such as Microsoft Access, SQL Server, and Oracle, support client-server architecture. RDBMS provides centralized functionality while supporting many users.
  • 2. 3. Three-tier architecture When implementing complex business solutions in two-tier architecture, the tier on which the business logic is implemented becomes over loaded. As a result, it takes more time to execute. Therefore, to provide further flexibility, the two-tier architecture can be split into three tiers. In three tier architecture, the first tier is the client tier. The second or the middle tier is called the business tier. The third tier is called the Server tier. The server tier contains a database server that manages the data. All the three service layers reside separately, either on the same machine or on different machines. In this architecture, an additional tier called a business tier has been added between the client tier and the server tier, as shown in the following figure. Figure 1.2 Three-tier architecture The business tier consists of all the business rules. It consists of the application logic that implements business rules and validates the data. The advantage of a three tier application is that it allows you to change the business rules without affecting the other two tiers. 4. N-tier architecture As the business complexities increased, the business tier became larger and unmanageable. This led to the evolution of n-tier architecture, where the business services model was divided into smaller manageable units. N-tier is also called multi tier architecture. In this architecture, one components near the client tier is responsible to do the client side validation and send the data to the presentation tier. Therefore, it is possible to keep the UI-centric processing component on a computer near the client. The UI-centric processing component is responsible for processing the data received from and sent to the presentation tier. Data- centric processing components are responsible for accessing the data tier to retrieve, modify, and delete data to and from the database server.The N-tier architecture consists of the following layers:  Client tier  UI-Centric processing components  Data-Centric processing object  Database Server Applications that follow multi tier can be used across various locations. For example, in Web application, an application is stored on the Web server. The clients access the applications from any location through a browser. The clients make requests to the web server and receive responses.