Saving a richtextbox

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Visual-Studio

i just have went from VB 2008 to VB 2022 what a problem for me, but here is my question...

i converted some code and got this error

System.UnauthorizedAccessException: 'Access to the path 'C:\1_temp\Testfile.rtf' is denied.'

my test code is as follows... the first thing i do is create a file in the folder, so i know every thing is working, I load the list box, then save it, that is when i get the error, and nothing is saved

Public Class Form1
    Dim RichTextFile As String = "C:\1_temp\Testfile.rtf"

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        'Dim file As System.IO.FileStream
        Dim File = System.IO.File.Create("C:\1_temp\Testfile.txt")

        ' load richtextbox
        RichTextBox.LoadFile(RichTextFile)

        On Error Resume Next
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        RichTextBox.SaveFile(RichTextFile, RichTextBoxStreamType.RichText)
        On Error Resume Next
        End
    End Sub



End Class

What I have tried:

thanks for the help with this problem