Problem with login system for my encrypter.

[Jbknight3]

Im having a bit of trouble with getting my login system to cooperate with my encrypter/decrypter. When I test out my program, I find that my login system is not doing its job and even if I type my information wrong on the login, it will still encrypt/decrypt my text.(from form1) Here is my code. Hopefully someone can tell me what im missing.

Public Class Form1
    Dim DES As New System.Security.Cryptography.TripleDESCryptoServiceProvider
    Dim Hash As New System.Security.Cryptography.MD5CryptoServiceProvider
    Dim SecondForm As New LoginForm1
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        SecondForm.Show()
        Try
            DES.Key = Hash.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(TextBox1.Text))
            DES.Mode = Security.Cryptography.CipherMode.ECB
            Dim DESEncrypter As System.Security.Cryptography.ICryptoTransform = DES.CreateEncryptor
            Dim Buffer As Byte() = System.Text.ASCIIEncoding.ASCII.GetBytes(TextBox2.Text)
            TextBox2.Text = Convert.ToBase64String(DESEncrypter.TransformFinalBlock(Buffer, 0, Buffer.Length))
        Catch ex As Exception
            MessageBox.Show("The following error(s) have occurred: " & ex.Message, Me.Text, MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        SecondForm.Show()
        Try
            DES.Key = Hash.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(TextBox1.Text))
            DES.Mode = Security.Cryptography.CipherMode.ECB
            Dim DESDecrypter As System.Security.Cryptography.ICryptoTransform = DES.CreateDecryptor
            Dim Buffer As Byte() = Convert.FromBase64String(TextBox2.Text)
            TextBox2.Text = System.Text.ASCIIEncoding.ASCII.GetString(DESDecrypter.TransformFinalBlock(Buffer, 0, Buffer.Length))
        Catch ex As Exception
            MessageBox.Show("The following error(s) have occurred: " & ex.Message, Me.Text, MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try
    End Sub
End Class

Thanks In Advance.