#standard controller

 A Visualforce controller is a set of instructions that specify what happens when a user interacts with the components specified in associated Visualforce markup, such as when a user clicks a button or link.          There are three types of controllers available in visualforce. Those are:      Standard Controllers      Controllers      Extensions          Standard Controllers:      A Visualforce controller is an arrangement of directions that indicate what happens when a client cooperates with the parts determined in related Visualforce markup, for example, when a client clicks a catch or connection. Controllers likewise give access to the information that thought to be shown in a page, and can alter segment conduct.

Create & Use Custom Controllers

Extra data about utilizing standard controllers:

Standard Controllers:

A Visualforce controller is an arrangement of directions that indicate what happens when a client cooperates with the parts determined in related Visualforce markup, for example, when a client clicks a catch or connection. Controllers likewise give access to the information that thought to be shown in a page, and can alter segment conduct.

Extra data about utilizing standard controllers:

·         Partner a Standard Controller with a Visualforce Page

·         Getting to Data with a Standard Controller

·         Utilizing Standard Controller Actions

·         Approval Rules and Standard Controllers

·         Styling Pages that Use Standard Controllers

·         Checking for Object Accessibility

·         Custom Controllers and Controller Extensions

Create & Use Custom Controllers

Prologue to Custom Controllers:

Custom controllers contain custom rationale and information control that can be utilized by a Visualforce page. How Visualforce bolsters the Model– View– Controller (MVC) plan design for building web applications. Controllers regularly recover the information to be shown in a Visualforce page, and contain code that executes in light of page activities, for example, a catch being clicked. When you utilize the standard controller, a lot of, well, standard usefulness is given to you by the stage.

Make a Visualforce Page that Uses a Custom Controller:

           By or take a reference the name of the controller class

<apex:page>                     controller              Attribute

At the point when your page utilizes a custom controller, you can't utilize a standard controller.

• Open the Developer Console and snap File | New | Visualforce Page to make another Visualforce page. Enter Contacts List Controller for the page name.

• In the editorial manager, supplant any markup with the accompanying.

<apex:page controller="ContactsListController">

   <apex:form>

       <apex:pageBlock title="Contacts List" id="contacts_list">

                       <!-- Contacts List goes here -->

       </apex:pageBlock>

   </apex:form>