Find a table column based on column name in ADO .NET

Hi,
I am in need of help trying to convert some old DAO code to ADO.NET
I need to find records in a table to identify and set some other variable for later use. Basically I need to find measurement units. Here is my old VB6 code:

query = "SELECT DISTINCTROW ScanOrder, NetDaqOrder, NetDaq, Channel, "
query = query & "NameLong, NameShort, LowRange, HighRange, "
query = query & "SensorID , InputUnits, Unit, SignalType, CalibrationGroup, "
query = query & "LowMeas, LowReal, MedMeas, MedReal, HighMeas, HighReal, OrderNum "
query = query & "From AIN_Definition "
query = query & "ORDER BY OrderNum;"

Dim query, stuff As Recordset
Set stuff = MyDb.OpenRecordset(query)

Do Until stuff.EOF
      Select Case stuff.Fields("Unit")
              Case "°C", "°F"
                      localtype% = PhysTempe%
                Case "kPa"
                          localtype% = PhysPrAbs2%
                Case "in-lbs"
                          localtype% = PhysTorqu%
      End Select
Loop

My new code uses the same query and I have made the connection, created a dataset and a datatable. Here is my VB.NET code so far:

Dim daAinDefInit As New OleDb.OleDbDataAdapter(query, conn)
Dim dtAinDefInit As New DataTable
Dim drAinDefInit As DataRow
Dim dsAinDefInit As New DataSet("dsAinDefInit")
daAinDefInit.Fill(dtAinDefInit)

My question is: How do I loop through the dataset or dataTable searching the "Unit" column like I did in VB6 above? By the way, the Unit column is not always in the same position in the table for each project so I don't know if it will be in column 1 or 20 or somewhere in between. So I need to be able to find the column based on the string "Unit"

Appreciate any help to point me in the right direction.

Thanks,
Charlie