How to generate random numbers between given range?VB.NET

I'm trying to create computer guess game in which i think number between 1-100 and computer generate random number between 1-100 and user give response that generated number is too low or too high or correct guess.E.G computer generate number 23 if i give input L then next time it will generate number between 1 t0 23.If next time if it display 10 then i press H then it will generate numbers between 10 and 23 hope you understand what i am trying to do.And same for H. Thanks Here is my code i try

  Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    'Declare Variables
    Dim strGuess As Char
    Dim random As New Random
    Dim answer As Integer
    Dim low As Integer
    Dim high As Integer
   Line1:
    MessageBox.Show("You pick a number between 0 and 100 and i will try to guess.Respond")
    answer = random.Next(1, 100)
    strGuess = InputBox("Is it " & answer, "Number Guessing Game")

    ' lstGuesses.Items.Add(strGuess)'
    low = answer
  Line2:
    If (CChar(strGuess) = CChar("L")) Then

        low = random.Next(1, low)
        strGuess = InputBox("Is it " & low, "Number Guessing Game")

    End If

    GoTo Line2

    high = answer
  Line7:
    If (CChar(strGuess) = CChar("H")) Then

        high = random.Next(high, 100)
        strGuess = InputBox("Is it " & high, "Number Guessing Game ")

    End If
    GoTo Line7
 End Sub