Open "C:/Test.txt" For Input As #iFileN String?

i'm making a program for may computer project. Our teacher hasn't taught us about reading/writing a file yet. I tried running the code but VS underlines the string

Open "C:Test.txt" For Input As #iFileN

like so. and details as follows.

Open: Not declared. File I/O functionality is available in 'Microsoft.VisualBasic' namespace

C:Test.txt: Method arguments must be enclosed in parenthesis

For: Comma ,')' or a valid expression continuation expected.

I've tried adding Microsoft.VisualBasic reference but VS says it will be loaded automatically.Here's the whole code

Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim sFileText As String[code]....

Edit: I tried enclosing the C:... in parenthesis but the following statements becomes a FOR statement and is asking for an END for the FOR statement