Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim bil As Integer = TextBox1.Text
Select Case bil
Case 80 To 100
TextBox2.Text = "A"
Case 65 To 79
TextBox2.Text = "B"
Case 47 To 64
TextBox2.Text = "C"
Case 26 To 46
TextBox2.Text = "D"
Case Else
TextBox2.Text = "E"
End Select
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim pesan As String
pesan = MsgBox("Yakin Mau Keluar ??", vbYesNo, "Konfirmasi")
If pesan = vbYes Then
End
End If
End Sub
End Class

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