Basic Pagination with Custom Controller

VF Code:

<apex:page controller="PaginationWithCustomControllerClass">
    <apex:form >
        <apex:pageBlock title="Pagination with Custom Controller
" id="pgBlock">
            <apex:pageBlockTable value="{!Accounts}" var="acc" id="pgTable">
                <apex:column value="{!acc.Name}"/>
                <apex:column value="{!acc.Industry}"/>
                <apex:column value="{!acc.Rating}"/>
                <apex:column value="{!acc.Phone}"/>
            </apex:pageBlockTable>
            <br/>
            <b><apex:outputText value="Total Number of Records are {!totalrecords}"/> </b>
       
            <apex:pageBlockButtons >
                <apex:commandButton value="Previous" action="{!Previous}" rerender="pgBlock"
                                    status="status" disabled="{!DisablePrevious}" />
                <apex:commandButton value="Next" action="{!Next}" reRender="pgBlock"
                                    status="status" disabled="{!DisableNext}" />
                <apex:actionStatus id="status" startText="Loading..."/>
             

            </apex:pageBlockButtons>
        </apex:pageBlock>
    </apex:form>

</apex:page>

Controller Code:

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public with sharing class PaginationWithCustomControllerClass{ private Integer CountTotalRecords; private Integer OffsetSize = 0; private Integer QueryLimit = 10; public list <Account> lstAccount{get;set;} public PaginationWithCustomControllerClass(){ CountTotalRecords= [select count() from Account]; } public list <Account> getAccounts(){ lstAccount = new list <Account> (); lstAccount = [Select id, Name, Industry, Rating, Phone from Account order by Name limit :QueryLimit offset :OffsetSize]; return lstAccount; } public PageReference Next() { OffsetSize += QueryLimit; return null; } public PageReference Previous() { OffsetSize -= QueryLimit; return null; } public Boolean getDisablePrevious(){ if(OffsetSize>0){ return false; }else { return true; } } public Boolean getDisableNext() { if (OffsetSize + QueryLimit < countTotalRecords){ return false; }else { return true; } } public integer gettotalrecords(){ return [select count() from Account]; } }