Apex code

Just add the following lines just before you execute the Insert or Update statement in your Apex Extension class.

    dupcheck.dc3Api api = new dupcheck.dc3Api();
ApexPages.Message prevention = api.doDuplicatePrevention(**ObjectData**);
if (prevention != null) {
   ApexPages.addMessage(prevention);
   return null;
}

Replace the **ObjectData** with the object you are adding or updating.

Prerequisites

• You need to have the Advanced Edition of Duplicate Check for Salesforce.
• You have to use an extension class in your custom visualforce page.
• You need to use the following code in your VisualForce page to display the Duplicate Warning message:

< apex:pagemessages escape="false"/ >