Textbox input a Password

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VB

Visual-Studio

VS2012

I have a textbox in a form for input a password to open my application.
I want that the character don't be shown, only replaced with "*" for
each character that been inputted.

Can anyone explain how i will do that?

this is what i am doing--
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Dim myParamArray As New ArrayList

       Dim param As New OracleParameter()

       param.ParameterName = "pLogin"
       param.OracleDbType = OracleDbType.Varchar2
       param.Value = txtcod_ut.Text

       myParamArray.Add(param)

       Dim param1 As New OracleParameter()

       param1.ParameterName = "pPassword"
       param1.OracleDbType = OracleDbType.Varchar2
       param1.Value = txtpass.Text

       myParamArray.Add(param1)

       Dim name As Object

       name = oracleClient.ExecuteScalar("SELECT a.name   FROM userstable a   WHERE a.usercod = :pLogin and a.password = :pPassword" _
                                          , myParamArray)

       If Not name Is Nothing Then
           MsgBox("Welcome " & name.ToString & "!")
       Else
           MsgBox(" user invalid .")
       End If

       myParamArray.Clear()
       Me.Hide()
       My.Forms.First_page.ShowDialog()

       

       myParamArray = Nothing