Visual basic, select case

Bonjour,

voici mon bout de code, qui sert pour mon problème :


'Nom des monnaies
T(0, 0) = "francs"
T(1, 0) = "Yuan"
T(2, 0) = "Deutschmark"
T(3, 0) = "Livre Sterling"
T(4, 0) = "Rouble"
T(5, 0) = "Dollar"
'taux de conversion de monnaies
T(0, 1) = "6,55957"
T(1, 1) = "9,6718"
T(2, 1) = "1,897"
T(3, 1) = "0,803"
T(4, 1) = "36,1315"
T(5, 1) = "1,4144"
'drapeaux
T(0, 2) = folder & "France.gif"
T(1, 2) = folder & "Chine.gif"
T(2, 2) = folder & "Allemagne.JPG"
T(3, 2) = folder & "GB.gif"
T(4, 2) = folder & "Russie.JPG"
T(5, 2) = folder & "USA.JPG"



'liste déroulante
Private Sub listhaut_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.Load
listhaut.Items.Add("Francs")
listhaut.Items.Add("Yen")
listhaut.Items.Add("Deutschmark")
listhaut.Items.Add("Livre Sterling")
listhaut.Items.Add("Rouble")
listhaut.Items.Add("Dollar")

End Sub

Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles listhaut.SelectedValueChanged

Dim t1 as integer

Select T(t1, 0)
Case t1 = "0"
PictureBox1.Image = Image.FromFile(T(0, 2))
Case t1 = "1"
PictureBox1.Image = Image.FromFile(T(1, 2))
Case t1 = "2"
PictureBox1.Image = Image.FromFile(T(2, 2))
Case t1 = "3"
PictureBox1.Image = Image.FromFile(T(3, 2))
Case t1 = "4"
PictureBox1.Image = Image.FromFile(T(4, 2))
Case t1 = "5"
PictureBox1.Image = Image.FromFile(T(5, 2))
End Select


et j'ai une erreur au niveau de mon case, il me parle de booléen, je ne vois vraiment pas pourquoi :(

si un peu d'aide arrive assez vite, j'en serai très reconnaissant =)

Merci d'avance ;)