Question

Imports System.Data.SqlClient

Public Class Form1
Dim cn As SqlConnection
Dim ds As DataSet
Dim adapter As SqlDataAdapter
Dim eleveBindingSource As BindingSource
Dim builder As SqlCommandBuilder

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    cn = New SqlConnection("Data source=.; initial catalog=tp4_ado; integrated security=sspi")
    ds = New DataSet()
    eleveBindingSource = New BindingSource
    adapter = New SqlDataAdapter("Select * from Eleve", cn)
    adapter.Fill(ds, "Eleve")
    eleveBindingSource.DataSource = ds
    eleveBindingSource.DataMember = "Eleve"
    DataGridView1.DataSource = eleveBindingSource
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    adapter.Update(ds.Tables("Eleve"))
End Sub

End Class

Answer 1

The problem was that I didn’t Initialized UpdateCommand when I made modification to the DataGridView

So I Must add this code before updating the DataSet :

builder = New SqlCommandBuilder(adapter)