PagingTasksController.vfp

<apex:page controller="PagingTasksController">
    <apex:form >
        <apex:pageBlock title="Tasks" id="pgBlock">
           <apex:pageBlockButtons >
               <apex:commandButton action="{!save}" id="saveButton" value="Save"/>
               <apex:commandButton onclick="resetInlineEdit()" id="cancelButton" value="Cancel"/>
           </apex:pageBlockButtons>
  
        <apex:inlineEditSupport showOnEdit="saveButton, cancelButton"
                    hideOnEdit="editButton" event="ondblclick"
                    changedStyleClass="myBoldClass" resetFunction="resetInlineEdit"/>
  
         <apex:inputText id="searchBox" value="{!searchText}"/>
        <apex:commandButton value="Search" reRender="pgTable,pgBlock" action="{!findTasks}"/>
          <apex:pageBlockTable value="{!Tasks}" var="tsk" id="pgTable" >
           <apex:column >
            <apex:outputLink value="{!URLFOR($Action.Task.Delete, tsk.id,['retURL'='/apex/Task_Assignment_Features'])}" >Delete</apex:outputLink>
</apex:column>
        
          <apex:column headerValue="Subject">

                <apex:facet name="header">
                    <apex:commandLink value="Subject" action="{!toggleSort}" rerender="pgTable" >
                    <apex:param name="sortField" value="Subject" assignTo="{!sortField}"/>
                    <apex:outputPanel rendered="{!BEGINS(sortField,'Subject')}">
                        &nbsp;<apex:image value="{!IF(sortDir = 'desc','/img/arrowDown.gif','/img/arrowUp.gif')}"/>
                    </apex:outputPanel>
                    </apex:commandLink>
                </apex:facet>     
               
                <apex:outputField value="{!tsk.Subject}"/>
           </apex:column>
           <apex:column headerValue="Status">
             <apex:outputField value="{!tsk.Status}"/>
         </apex:column>
         <apex:column headerValue="Priority">
            <apex:outputField value="{!tsk.Priority}"/>
        </apex:column>
        <apex:column headerValue="OwnerId">
            <apex:outputField value="{!tsk.OwnerId}"/>
        </apex:column>
     </apex:pageBlockTable>
       <apex:pageBlockButtons >
                <apex:commandButton value="Previous" action="{!Previous}" rerender="pgTable,pgBlock"
                                    status="status" disabled="{!DisablePrevious}" />
                <apex:commandButton value="Next" action="{!Next}" reRender="pgTable,pgBlock"
                                    status="status" disabled="{!DisableNext}" />
                <apex:actionStatus id="status" startText="Please Wait..."/>
            </apex:pageBlockButtons>
        </apex:pageBlock>
    </apex:form>
     <apex:enhancedlist type="Activity" height="800" rowsPerPage="50" customizable="False"/>
</apex:page>