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ch ranjeethch ranjeeth 

How to call Batch apex in controller? Please provide some sample code?

Ravikant kediaRavikant kedia
Here is apex batch :
global class batchAccountUpdate implements Database.Batchable<sObject> {
    global Database.QueryLocator start(Database.BatchableContext BC) {
        String query = 'SELECT Id,Name FROM Account';
        return Database.getQueryLocator(query);
    global void execute(Database.BatchableContext BC, List<Account> scope) {
         for(Account a : scope)
             a.Name = a.Name + 'Updated';           
         update scope;
    global void finish(Database.BatchableContext BC) {

Now you can use below code for batch execute :

batchAccountUpdate batchaupdate = new batchAccountUpdate();