[Débutant] Reference à membre non partage

Bonjour,

apres l'execution de cet code une erreur se produit
Citation:
Erreur 2 Une référence à un membre non partagé requiert ...
Code:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
Public Class Form1
    Public n1 As Double
    Public signe As Byte
    Public tf As Byte
 
    Private Property n2 As Object
 
    Private Property n3 As Object
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(1)
        Else
            TextBox.Text = Str(1)
            tf = 0
        End If
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(2)
        Else
 
        End If
        TextBox.Text = Str(2)
        tf = 0
    End Sub
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(3)
        Else '
 
        End If
        TextBox.Text = Str(3)
        tf = 0
    End Sub
 
    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(4)
        Else
 
        End If
        TextBox.Text = Str(4)
        tf = 0
    End Sub
 
    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(5)
        Else
 
        End If
        TextBox.Text = Str(5)
        tf = 0
    End Sub
 
    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(6)
        Else
 
        End If
        TextBox.Text = Str(6)
        tf = 0
    End Sub
 
    Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(7)
        Else
 
        End If
        TextBox.Text = Str(7)
        tf = 0
    End Sub
 
    Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(8)
        Else
 
        End If
        TextBox.Text = Str(8)
        tf = 0
    End Sub
 
    Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
        If tf = 0 Then
            TextBox.Text = TextBox.Text + Str(9)
        Else
 
        End If
        TextBox.Text = Str(9)
        tf = 0
    End Sub
 
    Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
        n1 = Val(Text.TEXT)
        tf = 1
        signe = 1
    End Sub
 
    Private Sub Button11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button11.Click
        n1 = Val(Text.TEXT)
        tf = 1
        signe = 2
    End Sub
 
    Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click
        n1 = Val(TextBox.Text)
        tf = 1
        signe = 3
    End Sub
 
    Private Sub Button13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button13.Click
        n1 = Val(TextBox.Text)
        tf = 1
        signe = 4
    End Sub
 
    Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click
        TextBox.Text = ""
        n1 = 0
 
    End Sub
 
    Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click
        n2 = Val(TextBox.Text)
        Select Case signe
            Case 1
                n3 = n1 / n2
            Case 2
                n3 = n1 * n2
            Case 3
                n3 = n1 + n2
            Case 4
                n3 = n1 - n2
 
        End Select
        TextBox.Text = Str(3)
        tf = 1
    End Sub
 
    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
 
    End Sub
End Class
Merci de m'aider