I need a trigger code for picklist my picklist items are a)20, 2).50 ,3)60....one can select mulitiple options .if count is  less than  or equel to 100 it will saves .if count is greater than 100 it  have throw a message as the value must be less than 100...i need a trigger code for this

if  users "Complete" a task(Status) and do not update the Call Result field then display error message like "Call Result required when status marked as Completed.
Validation Rule and Trigger code.

I want This validation Code and Trigger

 i want this validation code

I want This validation Code and Trigger

 i want this validation code