Fahrenheit To Celsius in VB.NET

Problem

Write a program to ask the user to give temperature in Fahrenheit and then the program will convert the given temperature into Celsius equivalent. 

Formula to convert Fahrenheit to Celsius below

 °C = (°F  –  32)  x  5/9

Example 

50°F = 10°C ( (50°F – 32) multiplied by 5/9 = 10°C )

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Program Listing

' Fahrenheit To Celsius in VB.NET
' Prof. Jake Rodriguez Pomperada, MAED-IT, MIT
' www.jakerpomperada.com  and www.jakerpomperada.blogspot.com
' jakerpomperada@gmail.com
' Bacolod City, Negros Occidental Philippines
' May 17, 2021   Monday  3:56 PM

Public Class Form1

    Shared Function ConvertF2C(f As Double) As Double
        Return (f - 32) * 5 / 9
    End Function

    Private Sub btnConvert_Click(sender As Object, e As EventArgs) Handles btnConvert.Click

        Dim temperature As Double
        Dim result As Double

        temperature = Val(txtFahrenheit.Text)
        If txtFahrenheit.Text = "" Or IsNumeric(txtFahrenheit.Text) = False Then
            MessageBox.Show("Please enter temperature in Fahrenheit.", "Reminder", MessageBoxButtons.OK, MessageBoxIcon.Question)
            txtFahrenheit.Text = ""
            txtFahrenheit.Focus()
        Else
            result = ConvertF2C(temperature)
            txtCelsius.Text = result.ToString("#####.##") & "°C"
            txtCelsius.ReadOnly = True
        End If
    End Sub

    Private Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click
        txtFahrenheit.Text = ""
        txtCelsius.Text = ""
        txtFahrenheit.Focus()
    End Sub

    Private Sub btnQuit_Click(sender As Object, e As EventArgs) Handles btnQuit.Click
        Dim result = MessageBox.Show(" Are you sure you want to quit the program?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
        If result = DialogResult.Yes Then
            Me.Close()
        Else
            Me.Show()
            txtFahrenheit.Text = ""
            txtCelsius.Text = ""
            txtFahrenheit.Focus()
        End If
    End Sub
End Class