Imports IronXL
Imports System
Imports System.Data

' Supported for XLSX, XLS, XLSM, XLTX, CSV and TSV
Dim workBook As WorkBook = WorkBook.Load("sample.xlsx")

' Select default sheet
Dim workSheet As WorkSheet = workBook.DefaultWorkSheet

' Convert the worksheet to DataTable
Dim dataTable As DataTable = workSheet.ToDataTable(True)

' Enumerate by rows or columns first at your preference
For Each row As DataRow In dataTable.Rows
    For i As Integer = 0 To dataTable.Columns.Count - 1
        Console.Write(row(i))
    Next
Next