how do i create a coding to hide login password in visual basic 2012 (OOP method)

i'm working on coding of login form program using visual studio 2012 and SQL server 2012.

the function i want is this: when i type the password during login the password will show "*" instead of the password.

what is the coding to do that?

my login form: Public Class Form2

Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    BackColor = Color.LightGray
End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    ClassSiswa.namadatabase = "KPIRWAN"
    Dim caridata As SqlClient.SqlDataReader
    caridata = ClassSiswa.CariDataPengguna(ClassSiswa.opencon, TextBox1.Text, TextBox2.Text)
    If Not caridata.Read Then
        MsgBox("Nama dan Sandi Tidak Terdaftar")
    Else
        Me.Hide()
        Form1.Show()
    End If
    ClassSiswa.closecon()
End Sub

End Class