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Fahrenheit To Celsius in Microsoft Visual Basic NET

 

Program Listing

Public Class Form1

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

        Dim fahrenheit As Double

        Dim celsius As Double

        ' Validate input

        If Double.TryParse(txtFahrenheit.Text, fahrenheit) Then

            celsius = (fahrenheit - 32) * 5 / 9

            lblResult.Text = "Celsius: " & Math.Round(celsius, 2).ToString()

        Else

            MessageBox.Show("Please enter a valid number.", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)

        End If

    End Sub

    Private Sub btnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClear.Click

        lblResult.Text = ""

        txtFahrenheit.Clear()

        txtFahrenheit.Focus()

    End Sub

    Private Sub btnQuit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnQuit.Click

        Dim result As DialogResult

        result = MessageBox.Show("Do you want to quit?", "Exit Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question)

        lblResult.Text = ""

        txtFahrenheit.Clear()

        txtFahrenheit.Focus()

        If result = DialogResult.Yes Then

            Me.Close() ' Closes the current form

        End If

    End Sub

End Class

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