vb.net threading question

I'm trying to ensure that I'm using synclock correctly.

I have the following class

public class MyThreadTest
   private MyLockObject as new Object
   private lstOrgs as new List(of Org)
   Private AllergyUpdateThreadPool(MaxAllergyUpdateThreads) As Thread
   Private VendorCount as integer


   Public sub New()
          Dim x As Integer
                For x = 0 To UBound(AllergyUpdateThreadPool) - 1
                    AllergyUpdateThreadPool(x) = New Thread(AddressOf UpdateAllergy)
                    AllergyUpdateThreadPool(x).Name = "DrFirstAllergyUpdateThread #" + CStr(x)
                    ' AllergyUpdateThreadPool(x).Start()
                Next
     end sub


   public sub StartThreads(VendorList as list (of Org))
       dim x as integer
        SyncLock (MySyncLock)
                lstOrgs .Clear()
                LoadVendorList(VendorList)
                VendorCount = -1
          End SyncLock
           For x = 0 To UBound(AllergyUpdateThreadPool) - 1
                        AllergyUpdateThreadPool(x).Start()
            Next
end sub


 Private Sub UpdateAllergy()
          SyncLock (MySyncLock)
                        ' v = OperationQueue.Dequeue()
                        If VendorCount = lVendors.Count - 1 Then
                            VendorCount = 0
                        Else
                            VendorCount += 1
                        End If
                        v = lVendors(VendorCount)
               End SyncLock

                 'Do some work
end sub
           


In Main form
Dim  t as new MyThreadTest
Dim MyVendorList as new List (of Org)

'Load vendor list

t.StartAllergyUpdateProcess(MyVendorList)



Questions
1. Does this look like a safe approach for using the MyLockObject object for multiple threads in this class? Is it declared correctly or does it need to be a shared or protected variable?
2. Any other areas of concern (Note. this is a simplified version of what I'm doing)