Encrypting to SHA1 visual basic - VB 2010

I have an online SMF forum and when a user registers the password is encrypted with SHA1 in the database. I need to create a vb program with a login feature where only members of the forum can login. Now the part I'm stuck in is how do I encrypt the password into SHA1 in visual basic? I included some code which I don't know is correct or not so please help me out.

Imports System.Security.Cryptography
Public Class Form2

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    ' declare those variables
    Dim password As String
    Dim passwordSHA As String

    password = txtPassword.Text ' give password the value of the password textbox

    Call passwordEncryptSHA(password) ' Lets call the first password encryption function for SHA1

    passwordSHA = passwordEncryptSHA(password) ' give the variable the returned SHA value

    ' finally we will display both values in the corresponding textboxes
    txtSHA1.Text = passwordSHA


End Sub
Public Function passwordEncryptSHA(ByVal password As String) As String
    Dim sha As New SHA1CryptoServiceProvider ' declare sha as a new SHA1CryptoServiceProvider
    Dim bytesToHash() As Byte ' and here is a byte variable

    bytesToHash = System.Text.Encoding.ASCII.GetBytes(password) ' covert the password into ASCII code

    bytesToHash = sha.ComputeHash(bytesToHash) ' this is where the magic starts and the encryption begins

    Dim encPassword As String = ""

    For Each b As Byte In bytesToHash
        encPassword += b.ToString("x2")
    Next

    Return encPassword ' boom there goes the encrypted password!

End Function

Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

End Sub
End Class

Thank you and please don't be mean because I am still learning (I'm 15)!