I want to do an inline editing of pageblock for Task object .Scratching my head from hours . Please help me to modify my code .

<!-- VF page -->

<apex:page standardController="Task" extensions="TaskSearchController">
 
     <apex:form id="searchForm">
      <apex:PageBlock mode="edit">     
     
            <apex:pageBlockButtons >
                <apex:commandButton action="{!edit}" id="editButton" value="Edit"/>
                <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:pageblockSection id="searchBlockSection">
       <apex:pageBlockSectionItem id="searchBlockSectionItem">
        <apex:outputLabel >Keyword</apex:outputLabel>
            <apex:panelGroup >
                <apex:inputtext id="searchTextBox" value="{!searchText}">

                </apex:inputtext>
                <apex:commandButton Id="btnSearch" action="{!Search}" rerender="renderBlock" status="status" title="Search" value="Search">                    </apex:commandButton>
            </apex:panelGroup>
        </apex:pageBlockSectionItem>
    </apex:pageblockSection>
    <apex:actionStatus id="status" startText="Searching... please wait..."/>     
    <apex:pageBlocksection id="renderBlock" >
        <apex:pageblocktable value="{!SearchResults}" var="o" rendered="{!NOT(ISNULL(SearchResults))}">
            <apex:outputLink value="/{!o.Id}">{!o.Subject}</apex:outputLink>
            <apex:column value="{!o.Subject}"/>
            <apex:outputLink value="/{!o.Id}">{!o.Status}</apex:outputLink>
            <apex:column value="{!o.Status}"/>
            <apex:outputLink value="/{!o.Id}">{!o.ActivityDate}</apex:outputLink>
            <apex:column value="{!o.ActivityDate}"/>
     </apex:pageblocktable>    
    </apex:pageBlocksection>
   </apex:pageblock>
  </apex:form>

     <apex:enhancedlist type="Activity" height="800" rowsPerPage="50" customizable="False"/>
   </apex:page>


// Apex class


public class TaskSearchController
    {
       public apexpages.standardController controller{get;set;}
       public Task l;
       public List<Task> searchResults {get; set; }

      public string searchText
      {
       get
       {
         if (searchText==null) searchText = '';
         return searchText;
       }
      set;
       }

     public TaskSearchController(ApexPages.StandardController controller)
     {
        this.controller = controller;
        this.l = (Task) controller.getRecord();
      }

    public PageReference search()
    {
      if(SearchResults == null)
      {
        SearchResults = new List<Task>();
      }
     else
     {
        SearchResults.Clear();
     }

String qry ='Select Id,Subject,Status,ActivityDate from Task where Subject like \'%'+searchText+'%\' OR Status like \'%'+searchText+'%\' Order By Subject,Status,ActivityDate';


    SearchResults = Database.query(qry);
   //System.debug(SearchResults);
   return null;
    }
   }

Really appreciate the help.