Hi, to all here I created the standard controller with extension for sorting,pagination, alpha bar navigation and edit and delete link for in one controller.Here now I try to the button to add to this controller but I failed on the action. So can any one to help me to done this function on here.
My controller,

public class StandardPaginationSorting {

    // Variables required for Sorting.
    public String soql {get;set;}
    public List <Account> CandidateList1 = New List <Account>();
    public String soqlsort {get;set;}
    public List <Account> CandidateList2 = New List <Account>();
    public List<Account> acc {get; set;}
    public List<Account> editdel {get; set;}

                // List used in to display the table in VF page.
                public List<Account> getCandidateList() {
                    // Passing the values of list to VF page.
                    return con.getRecords();
                    //all();
                }

                // instantiate the StandardSetController from a query locator
                public StandardPaginationSorting(ApexPages.StandardController controller){
                 con.getRecords();
                 all();
                 LoadData();
                }
                public ApexPages.StandardSetController con {
                    get {
                                                if(con == null) {
                                                                // String Query to have a list of cases for a respective End-user.
                                                                soql = 'SELECT Name, Website, BillingCountry, Phone, Type, Owner.Name FROM Account';

                                                                // Passing the String array to a list with Selected field sorting.
                                                                CandidateList1 = Database.query(soql + ' order by ' + sortField + ' ' + sortDir ); 

                                                                // setting values of List in StandardSetController.
                                                                con = new ApexPages.StandardSetController(CandidateList1);

                                                                // sets the number of records in each page set
                                                                con.setPageSize(10);
                                                }
                                                return con;
        }
        set;
    }

    // indicates whether there are more records after the current page set.
    public Boolean hasNext {
        get {
            return con.getHasNext();
        }
        set;
    }

    // indicates whether there are more records before the current page set.
    public Boolean hasPrevious {
        get {
            return con.getHasPrevious();
        }
        set;
    }

    // returns the page number of the current page set
    public Integer pageNumber {
        get {
            return con.getPageNumber();
        }
        set;
    }

    // returns the first page of records
    public void first() {
        con.first();
    }

    // returns the last page of records
    public void last() {
        con.last();
    }

    // returns the previous page of records
    public void previous() {
        con.previous();
    }

    // returns the next page of records
    public void next() {
        con.next();
    }

    // returns the PageReference of the original page, if known, or the home page.
    public void cancel() {
        con.cancel();
    }

    // Method for Constructor is used for Test Class.
    public StandardPaginationSorting(){ 
        //all();     
    }

   //Toggles the sorting of query from asc<-->desc
    public void toggleSort() {
        // simply toggle the direction
        sortDir = sortDir.equals('asc') ? 'desc' : 'asc';

                                // run the query again for sorting other columns
                                soqlsort = 'SELECT Id, Name, Phone, BillingCountry, Website, Owner.Name, Type FROM Account'; 

                                // Adding String array to a List array
                                CandidateList2 = Database.query(soqlsort + ' order by ' + sortField + ' ' + sortDir ); 

                                // Adding Caselist to Standard Pagination controller variable
                                con = new ApexPages.StandardSetController(CandidateList2);

                                // Set Page Size to 10
                                con.setPageSize(10);

    }

    // the current sort direction. defaults to asc
    public String sortDir {
        // To set a Direction either in ascending order or descending order.
                                get  { if (sortDir == null) {  sortDir = 'asc';} return sortDir;}
        set;
    }

    // the current field to sort by. defaults to last name
    public String sortField {
        // To set a Field for sorting.
                                get  { if (sortField == null) {sortField = 'Name'; } return sortField;  }
        set;
    } 
    
    ///For refresh function button
    public PageReference Refresh() {
    PageReference pageRef = new PageReference(ApexPages.currentPage().getUrl()); 
    pageRef.setRedirect(true); 
    return pageRef;
    }
    
    //For the New Account Button
    String accnew = 'eeee';
    public PageReference NewAccount() {
    Pagereference Newacc = new PageReference(ApexPages.currentPage().getUrl());
    Newacc.setRedirect();
    return Newacc;
    }
    
    // the edit and delete link function
    
    ////used to get a hold of the account record selected for deletion
    public string selectedAccountId {get; set;}
    
    public void LoadData() {
        editdel = [SELECT Id, Name, Phone, BillingCountry, Website, Owner.Name, Type FROM Account];
        con = new ApexPages.StandardSetController(editdel);
        con.SetPageSize(10);
    }
    
    public void deleteAccount() {
        
        If(selectedAccountId == Null){
            system.debug('@@@@@@@@@@@@@@@@'+selectedAccountId);
            return;
        }
        
        //Find account record with in collection
        
        Account deleteacc = Null;
        For(Account a : editdel)
            If(a.Id == selectedAccountId){
                deleteacc = a;
                system.debug ('@@@@@@@@@@@@@@@@@@'+a);
                //Delete deleteacc;
                break;
            } 
            
            //If account record found to delete it  
            If(deleteacc != Null) {
               Delete deleteacc; 
            }
        //refresh the dataList
        LoadData();
    } 
    
    //the alpha bar navigation filter
    
    String A;
    public PageReference aaa() {
        A = 'a';
        acc.clear();
        String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+A+'%\' ORDER BY Name';
        acc= Database.query(qry);
        con = new ApexPages.StandardSetController(acc);
        return null;
    }
    
    String B;
    public PageReference bbb() {
        B = 'b';
        acc.clear();
        String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+B+'%\' ORDER BY Name';
        acc= Database.query(qry);
        con = new ApexPages.StandardSetController(acc);
        return null;
    }
    
    String C;
    public PageReference ccc() {
        C = 'c';
        acc.clear();
        String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+C+'%\' ORDER BY Name';
        acc= Database.query(qry);
        con = new ApexPages.StandardSetController(acc);
        return null;
    }
       
    String D;
    public PageReference ddd() {
        D = 'd';
        acc.clear();
        String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+D+'%\' ORDER BY Name';
        acc= Database.query(qry);
        con = new ApexPages.StandardSetController(acc);
        return null;
    }
    
    String E;
    public PageReference eee() {
        E = 'e';
        acc.clear();
        String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+E+'%\' ORDER BY Name';
        acc= Database.query(qry);
        con = new ApexPages.StandardSetController(acc);
        return null;
    }
    
    String F;
    public PageReference fff() {
    F = 'f';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+F+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return null;
    }

     String G;
    public PageReference ggg() {
        G = 'g';
        acc.clear();
        String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+G+'%\' ORDER BY Name';
        acc= Database.query(qry);
        con = new ApexPages.StandardSetController(acc);
        return null;
    }
    
    String H;
    public PageReference hhh() {
     H = 'h';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+H+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String I;
    public PageReference iii() {
     I = 'i';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+I+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String J;
    public PageReference jjj() {
     J = 'j';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+J+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String K;
    public PageReference kkk() {
     K = 'k';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+K+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String L;
    public PageReference lll() {
     L = 'l';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+L+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String M;
    public PageReference mmm() {
    M = 'm';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+M+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return null;
    }
    
    String N;
    public PageReference nnn() {
     N = 'n';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+N+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String O;
    public PageReference ooo() {
    O = 'o';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+O+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return null;
    }
    
    String P;
    public PageReference ppp() {
     P = 'p';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+P+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String Q;
    public PageReference qqq() {
     Q = 'q';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+Q+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String R;
    public PageReference rrr() {
     R = 'r';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+R+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String S;
    public PageReference sss() {
     S = 's';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+S+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String T;
    public PageReference ttt() {
     T = 't';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+T+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String U;
    public PageReference uuu() {
     U = 'u';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+U+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String V;
    public PageReference vvv() {
     V = 'v';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+V+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String W;
    public PageReference www() {
     W = 'w';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+W+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String X;
    public PageReference xxx() {
     X = 'x';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+X+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String Y;
    public PageReference yyy() {
     Y = 'y';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+Y+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    String Z;
    public PageReference zzz() {
     Z = 'z';
    acc.clear();
    String qry = 'SELECT  Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account WHERE Name LIKE \''+Z+'%\' ORDER BY Name';
    acc= Database.query(qry);
    con = new ApexPages.StandardSetController(acc);
        return Null;
    }
    
    public void all() {
        acc = [SELECT Name, Phone, Type, Owner.Name, BillingCountry, Website FROM Account];
        con = new ApexPages.StandardSetController(acc);
        con.setpagesize(10);
    }
    
    

}

My Page,

<apex:page standardController="Account" extensions="StandardPaginationSorting" showHeader="false" sidebar="false" applyHtmlTag="true">    
    <!-- CSS added to display alternate row colors and Center align Text in PageblockTable -->
    <!--<style type="text/css">
        .oddrow{background-color: #00FFFF; } 
        .evenrow{background-color: #7FFFD4; } 
        .textalign{text-align:center; } 
    </style>--->

    <apex:form id="form">
        <!-- Tabstyle attribute is used to assign the color scheme to the pageblock.Here Candidate Object color scheme is used for the pageblock-->
        
        <apex:pageBlock id="pgblock" tabStyle="Account">
            <!--<apex:pageBlockSection title="Candidate Details -  Page #{!pageNumber}" columns="1" collapsible="false">-->   
                <!-- Rowclasses attribute is used to define different CSS classes for different rows. 
                     Rules attribute is used: borders drawn between cells in the page block table.
                     Title attribute will be used as a help text when a user hovers mouse over the Page Block table.
                     Styleclass, HeaderClass attributes are used to Center align Table Text in Page Block table --->
            <!--refresh the page and showing the same result of this refresh button--->
            
                                
 
            <apex:pageBlockButtons location="top">
                <apex:commandButton value="Refresh" action="{!Refresh}" />
               <!-- <apex:commandButton onclick="{!NewAccount()}" value="Newaccount"/>--->
            </apex:pageBlockButtons>
            
            <right>
            <apex:toolbar id="toolbar" width="100" height="10" style="background-color:White;background-image:none;">
            <right><apex:toolbarGroup itemSeparator="line">
                <apex:commandLink value="A" Action="{!aaa}"/>
                <apex:commandLink value="B" Action="{!bbb}"/>
                <apex:commandLink value="C" Action="{!ccc}"/>
                <apex:commandLink value="D" Action="{!ddd}"/>
                <apex:commandLink value="E" Action="{!eee}"/>
                <apex:commandLink value="F" Action="{!fff}"/>
                <apex:commandLink value="G" Action="{!ggg}"/>
                <apex:commandLink value="H" Action="{!hhh}"/>
                <apex:commandLink value="I" Action="{!iii}"/>
                <apex:commandLink value="J" Action="{!jjj}"/>
                <apex:commandLink value="K" Action="{!kkk}"/>
                <apex:commandLink value="L" Action="{!lll}"/>
                <apex:commandLink value="M" Action="{!mmm}"/>
                <apex:commandLink value="N" Action="{!nnn}"/>
                <apex:commandLink value="O" Action="{!ooo}"/>
                <apex:commandLink value="P" Action="{!ppp}"/>
                <apex:commandLink value="Q" Action="{!qqq}"/>
                <apex:commandLink value="R" Action="{!rrr}"/>
                <apex:commandLink value="S" Action="{!sss}"/>
                <apex:commandLink value="T" Action="{!ttt}"/>
                <apex:commandLink value="U" Action="{!uuu}"/>
                <apex:commandLink value="V" Action="{!vvv}"/>
                <apex:commandLink value="W" Action="{!www}"/>
                <apex:commandLink value="X" Action="{!xxx}"/>
                <apex:commandLink value="Y" Action="{!yyy}"/>
                <apex:commandLink value="Z" Action="{!zzz}"/>
                <apex:commandLink value="All" Action="{!all}"/>                
            </apex:toolbarGroup></right>
        </apex:toolbar>
        </right>
        
                <apex:pageBlockTable value="{!CandidateList}" var="CadList"  title="Click Column Header for Sorting"  styleclass="textalign" headerClass="textalign" >                                        
                    
                    <apex:column headerValue="Action">                        
                        <apex:outputLink value="/{!CadList.id}/e?retURL=/apex/{!$CurrentPage.Name}" style="font-weight:bold">Edit</apex:outputLink>&nbsp;|&nbsp;
                        <a href="javascript:if (window.confirm('Are you sure?')) deleteAccount('{!CadList.Id}');" style="font-weight:bold">Del</a>                       
                    </apex:column>
                    
                    <apex:column >
                        <apex:facet name="header">
                           <apex:commandLink value="Name" action="{!toggleSort}" rerender="pgblock">
                                <!-- Value attribute should have field (API Name) to sort in asc or desc order -->
                                <apex:param name="sortField" value="Name" assignTo="{!sortField}"/>
                           </apex:commandLink>
                        </apex:facet>
                        <apex:outputLink value="/{!CadList.Id}" target="_blank">{!CadList.Name}</apex:outputLink>
                        <!--<apex:outputField value="{!CadList.Name}"/>-->
                    </apex:column> 

                    <apex:column >
                        <apex:facet name="header">
                            <apex:commandLink value="Phone" action="{!toggleSort}" rerender="pgblock">
                                <apex:param name="sortField" value="Phone" assignTo="{!sortField}"/>
                            </apex:commandLink>
                        </apex:facet>
                        <apex:outputField value="{!CadList.Phone}"/>
                    </apex:column>

                  <!--  <apex:column >
                        <apex:facet name="header">
                            <apex:commandLink value="Name" action="{!toggleSort}" rerender="pgblock">
                                <apex:param name="sortField" value="Email" assignTo="{!sortField}"/>
                            </apex:commandLink>
                        </apex:facet>
                        <apex:outputField value="{!CadList.Email}"/>
                    </apex:column>-->

                    <apex:column >
                        <apex:facet name="header">
                            <apex:commandLink value="Type" action="{!toggleSort}" rerender="pgblock">
                                <apex:param name="sortField" value="Type" assignTo="{!sortField}"/>
                            </apex:commandLink>
                        </apex:facet>
                        <apex:outputField value="{!CadList.Type}"/>
                    </apex:column>

                    <apex:column >
                        <apex:facet name="header">
                            <apex:commandLink value="OwnerName" action="{!toggleSort}" rerender="pgblock">
                                <apex:param name="sortField" value="Owner.Name" assignTo="{!sortField}"/>
                            </apex:commandLink>
                        </apex:facet>
                        <apex:outputField value="{!CadList.Owner.Name}"/>
                    </apex:column>

                    <apex:column >
                        <apex:facet name="header">
                            <apex:commandLink value="Website" action="{!toggleSort}" rerender="pgblock">
                                <apex:param name="sortField" value="Website" assignTo="{!sortField}"/>
                            </apex:commandLink>
                        </apex:facet>
                        <apex:outputField value="{!CadList.Website}"/>
                    </apex:column>
                    
                </apex:pageBlockTable>
            <!---</apex:pageBlockSection>---->

            <apex:panelGrid columns="6">
                <apex:commandLink action="{!first}">First</apex:commandlink>
                <apex:commandLink action="{!previous}" rendered="{!hasPrevious}">Previous</apex:commandlink>
                <apex:commandLink action="{!next}" rendered="{!hasNext}">Next</apex:commandlink>
                <apex:commandLink action="{!last}">Last</apex:commandlink>
                <apex:inputText value="{!pageNumber}"> PageNumber</apex:inputText> of 4
            </apex:panelGrid>

        </apex:pageBlock>
        <apex:actionFunction action="{!deleteAccount}" name="deleteAccount" reRender="form" >
           <apex:param name="accountid" value="" assignTo="{!selectedAccountId}"/>
        </apex:actionFunction>
    </apex:form>
</apex:page>

Here I want the button name: New button.
it's function : when I clicked the button it's redirect me to the account creation page if I click the cancel it's return to the current(previous)
output page. or it's returned the output page of the my visual page after creating the account.
For answer'sthanks in advance