Before Delete Trigger Salesforce Code Example

Example: before delete trigger in salesforce

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.');      }          }     }  }