Find Row in Access DataTable - vb.net

Question

I need to see if a row exists in a DataTable where a field in the table (plan_code) matches a variable (strPlanCode). If it finds a match, it then obtains the value from another field in that row; if not, it writes the row to an error list. The direction I started with was to set up a DataTable like this:
Using daProduct As New OleDbDataAdapter("SELECT * FROM [product]", con)
Dim cbProduct = New OleDbCommandBuilder(daProduct)
cbExtract.QuotePrefix = "["
cbExtract.QuoteSuffix = "]"
Dim dtProduct = New DataTable
daProduct.Fill(dtProduct)
But no methods from there seem to work and I'm wondering if I shouldn't have gone down the DataAdapter/DataTable path.
Some of the ones I've tried are:
strSearch = "plan_code = " & strPlanCode
intProdRow = dtProduct.Select(strSearch)
and
intProdRow = dtProduct.SelectCommand(strSearch)
But none of these get a result and/or will compile.
The old code, which used ODBC to connect to an SQL Anywhere DB, looks like this:
ls_command = "select * from product"
selectCMD = New OdbcCommand(ls_command, connectDB)
selectCMD.CommandTimeout = 30
productDA.SelectCommand = selectCMD
productDA.Fill(clp_valDS, "product")
porductTBL = clp_valDS.Tables("product")
productTBL.PrimaryKey = New DataColumn() {productTBL.Columns("plan_code")}
productDR = productTBL.Rows.Find(ls_plan_code)
If (productDR Is Nothing) Then
ls_error_message = "Plan Code " + ls_plan_code + " not found"
GoTo ErrorHandler
Else
ls_secondary_guar = productDR("secondary_guar")
End If

Answer 1

I would use the following approach:
For Each row As System.Data.DataRow In dtProduct.Rows
if not row.item("plan_code") is DBNull.Value then
If row.Item("plan_code").ToString = strPlanCode Then
'do what you want with the matching row.
End If
end if
Next