The btnSum_Click event handler has an error. (using 1, 2 and 3 as your test numb

Question

The btnSum_Click event handler has an error.
(using 1, 2 and 3 as your test numbers). Fix the error so the application correctly displays the sum of the numbers. Describe what you had to do to fix the error.

Public Class Form1

    Private Sub btnSum_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSum.Click
        Dim sum As Single

        sum = CSng(txtNum1.Text & txtNum2.Text & txtNum3.Text)
        lblSum.Text = sum.ToString
    End Sub

    Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
        ' Close the form.
        Me.Close()
    End Sub

    Private Sub txtNum1_TextChanged(sender As Object, e As EventArgs) Handles txtNum1.TextChanged

    End Sub

    Private Sub lblSum_Click(sender As Object, e As EventArgs) Handles lblSum.Click

    End Sub
End Class

Explanation / Answer

Public Class Form1

Private Sub btnSum_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSum.Click
Dim sum As Single

sum = CSng(txtNum1.Text & txtNum2.Text & txtNum3.Text)
lblSum.Text = sum.ToString
End Sub

Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
' Close the form.
Me.Close()
End Sub
End Class

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