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Regarding Cross object field updates

Hi everyone,


i have 2 objects for example Object A ,Object B.Now my requirement is in such a way , that object A & B are not related to each other....No masterdetail relationship is  there between A& B.But i want to write a trigger in such a way,that when the trigger (afer insert,after,update,before insert,before update)  on Object A fires then i want to update the fields in object B (For example updating a checkbox field in object B).....  


SO as iam new to triggers in salesfo.rce, please help me with an example code.....for doing cross field updation




If there is no relationship between the objects, how will you identify object B that needs to be updated when object A changes? 

hi bob,


 Thank u so much , i understood that i cant update fields of such objects...Thanks a lot for ur valuable suggestion .So if possible will you please send me an example on field updation between 2 objects  where dere is master detail relationship between 2 objects.... Please help me an example as iam just trying to learn triggers.....


this might help

trigger Assignedupdate on Assigned__c ( before insert )
CAS__c  c = Trigger.new[0];
Activity__c cas=[Select Id,CAS_Assigned__c from Activity__c where Id=:c.Request__c ];
cas.CAS__c = c.CAS_c;

update cas;