Is it possible for me to write a condition in this invoke code

Hello i have this code to get distinct values using two columns (Instrument_code & lcy_amount) on the table. this code groups all duplicate values into the variable distinct values.
The issue now is that when a cell in the columns (Instrument_code & lcy_amount) it throws an error dbnull cannot be converted to string or integer .
Is it possible for me to write a condition in that
--------------Distinct values-------------------
Try
distinctValues = dt.AsEnumerable().
GroupBy(Function (row) New With
{
Key .REF = CStr(row(“Instrument_code”)),
Key .ABS = CInt(row(“lcy_amount”))
}).
Where (Function(Group) (Group.Count() = 1)).ToList.SelectMany(Function(m) m).CopyToDataTable()
Catch ex As Exception
errorMessage = ex.Message
End Try
---------Non Distinct values-------------
Try
NondistinctValues = dt.AsEnumerable().
GroupBy(Function (row) New With
{
Key .REF = CStr(row(“Instrument_code”)),
Key .ABS = CInt(row(“lcy_amount”))
}).
Where (Function(Group) (Group.Count() > 1)).ToList.SelectMany(Function(m) m).CopyToDataTable()
Catch ex As Exception
errorMessage = ex.Message
End Try

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