Custom Error Message for Event Receiver 

public override void ItemAdding(SPItemEventProperties properties)
{
       try
       {

           base.ItemAdding(properties);
           EventFiringEnabled = false;

           if (!properties.AfterUrl.EndsWith("doc"))
           {
               properties.ErrorMessage = "You are allowed to updload only .doc files";
               properties.Status = SPEventReceiverStatus.CancelWithError;
               properties.Cancel = true;

           }
       }
       catch (Exception ex)
       {
           properties.Status = SPEventReceiverStatus.CancelWithError;
           properties.ErrorMessage = ex.Message.ToString();
           properties.Cancel = true;
       }

}

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