Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) _
     Handles MyBase.Load
        RadioButton1.Checked = True
    End Sub
 
    Private Sub Berechnen()
 
        Dim Gewicht As Single
        Dim Groesse As Single
        Dim Idealgewicht As Single
        Dim Faktor As Single = 0.9
 
        If RadioButton2.Checked = True Then Faktor = 0.85
 
        If Trim$(TextBox1.Text) <> "" Then
            Gewicht = CDec(TextBox1.Text)
        Else
            Gewicht = 0
        End If
 
        If Trim$(TextBox2.Text) <> "" Then
            Groesse = CDec(TextBox2.Text)
        Else
            Groesse = 0
        End If
 
        If Gewicht > 0 And Groesse > 0 Then
            Idealgewicht = CSng((Groesse - 100) * 0.9)
            Label1.Text() = "Ihr Idealgewicht: " & Idealgewicht & " kg" & " -" & _
              "Ihr Gewicht:" & Gewicht.ToString("0") & " kg"
 
            Select Case Gewicht - Idealgewicht
                Case Is < -0.5
                    Label4.Text = "Sie haben Untergewicht"
                Case Is > 0.5
                    Label4.Text = "Sie haben Übergewicht"
                Case Else
                    Label4.Text = "Sie haben Normalgewicht"
            End Select
 
        Else
            Label1.Text() = "Ihr Wert: " & 0
        End If
 
    End Sub
 
    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles TextBox1.TextChanged
        Berechnen()
    End Sub
 
    Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles TextBox2.TextChanged
        Berechnen()
    End Sub
 
    Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Label1.Click
 
    End Sub
 
    Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged
 
    End Sub
End Class