Help to read into Database (vb code)

I am unsure as to how to read into database any help would be great

Imports System.Data.SqlClient

Public Class Form1

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

'-- create datatable X2

Dim Datatbl As New DataTable

 Datatbl.Columns.Add("X", GetType(String))



'-- Read into datatable



HELP WITH THIS PART PLEAESE