难倒我为什么会收到 "System.ArgumentOutOfRangeException" 错误

Question

我运行的 Visual Basic class 程序出现问题，这让我很困惑。作业是一个猜谜游戏，我要创建一个私有子程序，它会在用户输入的范围内生成一个随机数（即... 1 - 100）。我似乎有这个功能，除了告诉计算机猜测更低。目前，如果我按 "Higher" 游戏继续，但如果我按 "Lower"，则会抛出 "minValue cannot exceed maxValue" 错误。如果文本框中的输出高于我的 lownum 变量，为什么会出现此错误？加粗的代码是我自己写的，其他的都是自己写的

Public Class frmGuess
Dim highNum As Integer
Dim lowNum As Integer
Dim guess As Integer

Private Sub frmGuess_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    MessageBox.Show("Lets Play a Game!")
    'Fixed the grammatical error below - "Think of an whole number" is incorrect.
    MessageBox.Show("Think of a whole number -- DON'T TELL ME!")
    MessageBox.Show("Now give me a range you want me to guess in... like 1 to 100.")
    lowNum = InputBox("Whats the starting value?", "Lowest Value")
    highNum = InputBox("Whats the ending value?", "Highest Value")
    lblTitle.Text = "I am guessing a number between " & lowNum & " and " & highNum & "."
    newGuess()
End Sub

**Sub newGuess()
    '
    '   ITS GONE! OH NO!
    '
    'New Guess Sub - Calculates a response based on the input from user and recalculates responses to guess the number.
    'Setting New Variables
    Dim random As New Random

    'Generating Response
    txtGuess.Clear()
    txtGuess.Text = random.Next(lowNum, highNum + 1)

End Sub**

Private Sub btnLower_Click(sender As Object, e As EventArgs) Handles btnLower.Click
    highNum = guess - 1
    newGuess()
End Sub

Private Sub btnHigher_Click(sender As Object, e As EventArgs) Handles btnHigher.Click
    lowNum = guess + 1
    newGuess()
End Sub

Private Sub btnCorrect_Click(sender As Object, e As EventArgs) Handles btnCorrect.Click
    MessageBox.Show("I win. I told you I was awesome.")
    Close()
End Sub

Private Sub txtGuess_TextChanged(sender As Object, e As EventArgs) Handles txtGuess.TextChanged

End Sub

结束Class

Answer 1

明白了，程序运行正常。

难倒我为什么会收到 "System.ArgumentOutOfRangeException" 错误

Stumped why I'm getting "System.ArgumentOutOfRangeException" error

random

visual-studio-2013