Dataset does not return 1st row?

cn = New ADODB.Connection
        cn.Open("Provider=Microsoft.Jet.OLEDB.4.0;" & _
                "Data Source=" & strInputFilePath & ";" & _
                "Extended Properties='text;HDR=NO;FMT=Delimited'")
        'create a new recordset
        rsSource = New ADODB.Recordset
        rsSource.CursorLocation = ADODB.CursorLocationEnum.adUseClient
        rsSource.CursorType = ADODB.CursorTypeEnum.adOpenStatic
        rsSource.LockType = ADODB.LockTypeEnum.adLockBatchOptimistic
        rsSource.Open("SELECT * FROM [" & System.IO.Path.GetFileName(strInputFile) & "]", cn)
        rsSource.ActiveConnection = Nothing
        cn.Close()
 
        Dim daDataAdapter As New System.Data.OleDb.OleDbDataAdapter()
        Dim dsDataSet As New DataSet()
        Dim drRow As DataRow
        daDataAdapter.Fill(dsDataSet, rsSource, System.IO.Path.GetFileName(strInputFile))
        
        Dim lngMaxRows As Long = dsDataSet.Tables(0).Rows.Count
        Dim sw As StreamWriter
        Dim dcColumn As DataColumn
       
        sw = New StreamWriter(strOutputFile)
        'Loop through Input file dataset
        For Each drRow In dsDataSet.Tables(0).Rows
 
            For Each dcColumn In dsDataSet.Tables(0).Columns
                If dcColumn.ColumnName.ToString = "SEQ_NO" Then
                    'format this field
                    str = str & drRow("SEQ_NO").ToString("00000000")
                Else
                    str = str & drRow(dcColumn.ColumnName) & Chr(9)
                End If
            Next
            sw.WriteLine(str)
        Next

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