how to cell lock in excel using javascript in vb.net

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VB

Javascript

.NET

In this code excel cell are auto fill through database now i want to those cell are fill only they are locked

function CreateExcel() {

            document.all.OA1.CreateNew("Excel.Application");
            var testNo = document.getElementById("<%=txttestno.ClientID %>");
            var PlantCD = document.getElementById("<%=cmbPlant.ClientID %>");

            var sExcelData = Modules_masters_TestMethodMaster_TestMethodMaster.ReExcelScreen(testNo.value, PlantCD.value); // Take excel date to database

            var objExcel = document.OA1.GetApplication();
            var worksheet = objExcel.ActiveSheet; //Excel sheet
            var sdata = sExcelData.value;
            var aRow = sdata.split(',');//Data split

            for (i = 0; i < aRow.length; i++) {
                var aCol = aRow[i].split('#'); //Data split
                for (j = 0; j < aCol.length; j++) {
                    var result = worksheet.cells(i + 1, j + 1).Formula = aCol[j + 1]; // Data fill in excel cell
                  
  if (result != "") {
//For check cell data for locking, here i want to protect or lock my cell data those are fill, they are not change in fill cell only change in blank cell
                        worksheet.cells(i + 1, j + 1).Style.Locked = true; // this code is not work
                                              
                    }
                }
            }
        }