VB.NET How to Update DataSource from DataGridView (Binding to Dataset.DataTable) - vb.net

Question

Halo All..
I'm working with Visual Studio 2019 to create WinFormApp
What i'm working with as follow:
Adding New DataSource from wizard which connect to Acces Database (store locally within app), Acces Database name is Supplier with only Headers (9 Headers) and no data.
Adding DataGridView to Form and bind it to SupplierDataSet.SupplierDataTable
Adding OpenFileDialog where users can browse Excel File then select Sheet Name and view the data in DataGridView.
Adding Import Button to save/update SupplierDataSet.SupplierDataTable
Here is my code:
Imports System.IO
Imports ExcelDataReader
Public Class Form2
Dim tables As DataTableCollection
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub BtnBrowse_Click(sender As Object, e As EventArgs) Handles BtnBrowse.Click
'read excel file
Using ofd As OpenFileDialog = New OpenFileDialog() With
{.Filter = "Excel Workbook|*.xlsx"}
If ofd.ShowDialog() = DialogResult.OK Then
TxtFileName.Text = ofd.FileName
Using stream = File.Open(ofd.FileName, FileMode.Open, FileAccess.Read)
Using reader As IExcelDataReader = ExcelReaderFactory.CreateReader(stream)
Dim result As DataSet = reader.AsDataSet(New ExcelDataSetConfiguration() With {
.ConfigureDataTable = Function(__) New ExcelDataTableConfiguration() With {
.UseHeaderRow = True}})
tables = result.Tables
CboSheet.Items.Clear()
For Each table As DataTable In tables
CboSheet.Items.Add(table.TableName)
Next
End Using
End Using
End If
End Using
End Sub
Private Sub CboSheet_SelectedIndexChanged(sender As Object, e As EventArgs) Handles CboSheet.SelectedIndexChanged
'Pupulate excel file data to DataGridView
Dim dt As DataTable = tables(CboSheet.SelectedItem.ToString())
DataGridView1.DataSource = dt
End Sub
Private Sub BtnImport_Click(sender As Object, e As EventArgs) Handles BtnImport.Click
'Here the code which I want to save/update SupplierDataSet.SupplierDataTable.
End Sub
End Class
Since i'm new for this (approx 2 weeks). I've no clue to how to update the DataTable
Please Help Me. Any help will be appreciated.
And So Many Thanks Before.