Difference entre datagridviewcomboboxcell et datagridviewcomboboxcolumn

Bonjour

datagridviewcomboboxcolumn est un des types de la colonne
peut être
datagridviewcomboboxcell pour modifiier une cellule de la colonne
ex

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Public Class Form1
    Private WithEvents button As New Button
    Private DGV As New DataGridView
    Private Sub init()
        'crée une colonne de type DataGridViewComboBoxColumn chaque combo contient item0 item1 ...item10
        Dim col1 As New DataGridViewComboBoxColumn
        With col1
            .Name = "combo"
            For iter = 0 To 10
                .Items.Add("items" & iter)
            Next
        End With
        DGV.Columns.Add(col1)
        DGV.Columns("combo").DefaultCellStyle.Font = New Font("arial", 12, FontStyle.Bold)
        For iter = 0 To 9
            DGV.Rows.Add()
        Next
 
        DGV.AutoResizeColumns()
        DGV.AutoSize = True
        Me.Controls.Add(DGV)
    End Sub
    Private Sub change()
        'modifier tous les deuxièmes combo  avec comboCell
        For iter = 1 To DGV.Rows.Count - 1 Step 2
            Dim comboCell As New DataGridViewComboBoxCell
            For iter1 = 0 To 10
                comboCell.Items.Add("TOTO" & iter1.ToString)
            Next
            DGV.Rows(iter).Cells("combo") = comboCell
        Next
    End Sub
 
    Private Sub Form1_Load(sender As Object, e As System.EventArgs) Handles Me.Load
        Me.Controls.Add(button)
        button.Text = "modifier"
        button.Location = New Point(10, 10)
        init()
        DGV.Location = New Point(50, button.Bottom + 10)
    End Sub
 
    Private Sub button_MouseClick(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles button.MouseClick
        change()
    End Sub
End Class