Как вызвать MessageBox с кнопками "Да" - "Нет" и обработать их нажатие

Public Class Form1
    'Stanislav Grabarev Assignment 5
 
    Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
        End
 
    End Sub
 
    Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
        txtFC.Clear()
 
    End Sub
 
    Private Sub btnFtoC_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnFtoC.Click
        Dim inputc, calculat, result, calculat2, cltxtFC As Single
        Try
            inputc = CSng(txtFC.Text)
            calculat = CSng(inputc - 32)
            calculat2 = (calculat * 5)
            result = calculat2 / 9
            cltxtFC = MessageBox.Show("F" & txtFC.Text & "=" & "C" & result & vbCrLf & "Would you like to start another temp conversion?", "Result", MessageBoxButtons.YesNo)
            If cltxtFC = vbYes Then
                txtFC.Clear()
            End If
 
        Catch
            MessageBox.Show("Illegal Value entered")
        End Try
 
    End Sub
 
    Private Sub btnCtoF_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCtoF.Click
        Dim inputf, calculatf, resultc, cltxtFC As Single
 
        Try
            inputf = CSng(txtFC.Text)
            calculatf = CSng(inputf * 9 / 5)
            resultc = calculatf + 32
            cltxtFC = MessageBox.Show("C" & txtFC.Text & "=" & "F" & resultc & vbCrLf & "Would you like to start another temp conversion?", "Result", MessageBoxButtons.YesNo)
            If cltxtFC = vbYes Then
                txtFC.Clear()
            End If
        Catch
            MessageBox.Show("Illegal Value entered")
        End Try
 
    End Sub
 
End Class

calculat = inputc - 32

calculatf = inputf * 9 / 5