Display error message on Vf page

I am having a VF page which has input text and i made them required by wrapping in outputlabel.
Like this

<apex:pageBlockSectionItem >
               <apex:outputLabel value="Contact Email"/>
               <apex:outputPanel layout="block" styleClass="requiredInput">
               <apex:outputPanel layout="block" styleClass="requiredBlock"/>
               <apex:inputtext label="Email" value="{!contactemail}"/>
               </apex:outputPanel>
            </apex:pageBlockSectionItem>

I would like to display error message when email field is not filled.

I am giving <apex:pagemessages /> in Vf page and below add message in apex class before i upsert contact.

if( Email == null || email== '' ){
ApexPages.addMessage( new ApexPages.Message( ApexPages.Severity.ERROR, 'Please enter Email'));
return null;
}
Still it doesnt work.Please guide me where am i going wrong.

July 25, 2016
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Akash_CRM
Hi Linda,

Looks like you are using the wrong variable name in the check of Controller, it should instead be:

if( contactemail == null || contactemail == '' ){
ApexPages.addMessage( new ApexPages.Message( ApexPages.Severity.ERROR, 'Please enter Email'));
return null;
}

Regards,
Akash.