Parameter in event handler is not hitting while debugging

I have a eventhandler like this code below :

viewer.LocalReport.SubreportProcessing += new Microsoft.Reporting.WebForms.SubreportProcessingEventHandler(LocalReport_SubreportProcessing);

And this method as a parameter for event handler above :

private static void LocalReport_SubreportProcessing(object sender, SubreportProcessingEventArgs e) {

        DateTime movementDate = Convert.ToDateTime(e.Parameters[0].Values[0]);

        TourTransactionsController controller = new TourTransactionsController();

        var movement = controller.Movements();

        List<Movement> movementList = new List<Movement>();
        movementList.Add(new Movement {
            Destination = "TEST",
            MovementDescription = "TEST",
            DateTime = Convert.ToDateTime("2017-09-25")
        });

        e.DataSources.Clear();

        e.DataSources.Add(new Microsoft.Reporting.WebForms.ReportDataSource() {
            Name = "DSMovements",
            Value = movementList
        });

        //throw new NotImplementedException();
    }

Both of those method is written in a WEB API Controller. The eventhandler is hitting while debugging, but after I press F11 (step into) while debugging the LocalReport_SubreportProcessing method is not hitting. Why is LocalReport_SubreportProcessing method not hitting ?

Any help or answer is really appreciated.