Hi,

         how to use rowindex in my cotroller please chech my code once

<apex:page controller="classcon" sidebar="false" showHeader="false">
 <apex:form >
 <apex:outputPanel rendered="{!clist}">
 <apex:pageBlock >
 <apex:dataTable value="{!Categories1}" var="c">
 <apex:column headerValue="contacts" >
 <apex:commandLink value="{!c.name}"  action="{!conlist}" >
 <apex:param name="conname" value="{!c.id}" id="aaa"/>
 </apex:commandLink>
 </apex:column>
 </apex:dataTable>
 </apex:pageBlock>
 <apex:panelGrid columns="2">
 <apex:commandLink action="{!previous}" rendered="{!hasprevious1}" ><b>Previous</b></apex:commandlink>
 <apex:commandLink action="{!next}" rendered="{!hasnext1}"><b>Next</b></apex:commandlink>
 </apex:panelGrid>
 
</apex:outputPanel>
<apex:pageBlock rendered="{!cdetail}"  >
<apex:pageBlockButtons location="bottom">
<apex:commandButton value="edit" action="{!edit}"/>
<apex:commandButton value="back" action="{!back}"/>
</apex:pageBlockButtons>
 <apex:pageblockSection >
 <apex:repeat value="{!Categories}" var="aaa">
<apex:param name="conname" value="{!aaa.id}"/>
 <apex:outputfield value="{!aaa.lastname}"/>
 <apex:outputfield value="{!aaa.phone}"/>
 <apex:outputfield value="{!aaa.email}"/>
 </apex:repeat>
 </apex:pageblockSection>
 <apex:panelGrid columns="2">
 <apex:commandLink action="{!previous}" ><b>Previous</b></apex:commandlink>
 <apex:commandLink action="{!next}" ><b>Next</b></apex:commandlink>
 </apex:panelGrid>
 </apex:pageBlock>
 <apex:pageBlock rendered="{!cedit}"  >
<apex:pageBlockButtons location="bottom">
<apex:commandButton value="save" action="{!save}"/>
<apex:commandButton value="back" action="{!back}"/>
</apex:pageBlockButtons>
 <apex:pageBlockSection >
 <apex:repeat value="{!Categories}" var="ab">
 <apex:inputfield value="{!ab.lastname}"/>
 <apex:inputfield value="{!ab.phone}"/>
 <apex:inputfield value="{!ab.email}"/>
</apex:repeat>
</apex:pageBlockSection>
 </apex:pageBlock>
 </apex:form>
</apex:page>

========================================================

public class classcon
{
public boolean clist {set;get;}
public boolean cdetail{set;get;}
public boolean cedit{set;get;}
public id i;
list<contact> con1=new list<contact>();
contact conlst=new contact();
public classcon()
{
clist=true;
cdetail=false;
cedit=false;
//con5 = new ApexPages.StandardSetController(Database.getQueryLocator([Select Id,name FROM Contact]));
//conlist=[select id,name from contact];
//system.debug('@@@@@@'+conlist);
}

public ApexPages.StandardSetController con {
         get{
              if(con== null)
              {  
               con = new ApexPages.StandardSetController(Database.getQueryLocator([Select id,lastname,phone,email FROM Contact]));
               con.setPageSize(1);
               system.debug('++++++++'+con);
             }
             return con;
         }
         set;
     }

public ApexPages.StandardSetController con5 {
         get{
              if(con5 == null)
              {  
               con5 = new ApexPages.StandardSetController(Database.getQueryLocator([Select id,lastname,name,phone,email FROM Contact]));
               con5.setPageSize(10);
               system.debug('++++++++'+con5);
             }
             return con5;
         }
         set;
     }
public void condetail()
{
 
clist=false;
cdetail=true;
cedit=false;
//con2=new contact();
//con2=[select id,lastname,name,phone,email from contact where id=:i];
//system.debug('========'+con2);
}
//public contact con2{get;set;}
public void edit()
{
clist=false;
cdetail=false;
cedit=true;
}

public void save()
{
//plist.clear();
clist=false;
cdetail=true;
cedit=false;
//con = new ApexPages.StandardSetController(Database.getQueryLocator([Select Id, lastname,phone,email FROM Contact ]));
//con.setPageSize(1);
//getCategories();
}
public void conlist()
{
id i=apexpages.currentpage().getparameters().get('conname');
//conlst=new contact();
//conlst=[select id,lastname,phone,email from contact where id=:i];
con = new ApexPages.StandardSetController(Database.getQueryLocator([Select Id,lastname,phone,email FROM Contact]));
con.setPageSize(1);
clist=false;
cdetail=true;
cedit=false;
}

public void back()
{
clist=true;
cdetail=false;
cedit=false;
//con = new ApexPages.StandardSetController(Database.getQueryLocator([Select Id, lastname,phone,email FROM Contact ]));
//con.setPageSize(1);
//conlist=[select id,name from contact];
//update conlist;
}
list<contact> plist1=new list<contact>();
public List<contact> getCategories1() {
plist1 = new List<contact>();
if(con5!=null)
for (contact c : (List<contact>)con5.getRecords())
plist1.add(c);
return plist1;
}
public list<contact> getCategories()
{
return con.getrecords();
}
public Boolean hasNext {
get {
return con.getHasNext();
}
set;
}
public Boolean hasPrevious{
get {
return con.getHasPrevious();
}
set;
}
public Boolean hasNext1 {
get {
return con5.getHasNext();
}
set;
}
public Boolean hasPrevious1{
get {
return con5.getHasPrevious();
}
set;
}
public void next()
{
con.next();
con5.next();
system.debug('$$$$$$'+Con5);
}
public void previous()
{
con.previous();
con5.previous();
}
}

Thank yor for reply.