How to read from a .txt file but between two points in the file

Private Sub buttonExecuteScript_Click(sender As Object, e As EventArgs) Handles buttonExecuteScript.Click
        
        Me.richTextBoxScriptHeader.Clear()
        fullFileName = strFilePath 

        If Not String.IsNullOrEmpty(fullFileName) Then
            Dim commentText As String = ExtractStringFromFile(fullFileName, "<#", "#>")
            Me.richTextBoxScriptHeader.Text = commentText
        End If
        End Sub
Private Function ExtractStringFromFile(ByVal fullFileName As String, ByVal startMarker As String, ByVal endMarker As String) As String
        Dim result As String = String.Empty

        If Not File.Exists(strFilePath) Then
            Msgbox("The passed filename does not exist.")
        End If

        Dim fileText As String = File.ReadAllText(strFilePath)
        Dim startMarkerPosition As Integer = fileText.IndexOf(startMarker) + startMarker.Length
        Dim endMarkerPosition As Integer = fileText.IndexOf(endMarker)

        If endMarkerPosition > startMarkerPosition Then
            result = fileText.Substring(startMarkerPosition, endMarkerPosition - startMarkerPosition)
        End If

        Return result
End Function

Dim lstring As String = "murugesh #read this text# abc"
       Dim lary() As String
       lary = Split(lstring, "#")
       MsgBox(lary(1))