Before Delete Trigger in Salesforce

Scenario:

    

Write a Trigger on Account Object, All it does is to prevents the Delete of an Account if a particular field(i.e.,Client_ID__c) is not Null.

Trigger Code:

trigger AccountTrigger on Account (before delete) 
{ 
   if(System.Trigger.IsDelete)
   { 
     for (Account acc : trigger.old)
  {
    if (String.isNotBlank(acc.Client_ID__c))
     { 
  acc.addError('You cannot delete This Account Please contact your Salesforce.com Administrator for assistance.');
     }
         } 
   }
 }

Notes:

Trigger.old

Returns a list of the old versions of the sObject records.Note that this sObject list is only available in update and delete triggers.

Trigger.isDelete

Returns true if this trigger was fired due to a delete operation, from the Salesforce user interface, Apex, or the API.

For more information/samples on trigger please check out here

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Hope this helps you..Enjoy..!