[.NET] inputbox的取消鍵如何按了就跳出

[tfg09730820 (猴)]

Public Class Form1
    Dim num1, num2, input, times As Integer
    Dim rnd As New Random
    Dim result As MsgBoxResult
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load


        Do
            num1 = rnd.Next(10, 100)
            num2 = rnd.Next(10, 100)
            times = 0

            Do
                times += 1
                input = InputBox(num1 & "+" & num2 & "= ?", "第" & times & "次
作答")
                If Str(input) = "" Then MsgBox("是否繼續", 4)

            Loop Until input = num1 + num2

            result = MsgBox("是否繼續", 4)
            If result = MsgBoxResult.No Then Exit Do
        Loop
        End
    End Sub
End Class


請問標紅的那邊要怎麼改

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