VS 2005 - Display SQL Databases In ListBox Without Connection?

How do I display may sql databases in listbox without connection? Is it possible? Right now I have this:

Dim connString As String = "Data Source=.sqlExpress; Integrated Security=True;"
Using sqlConn As New SqlConnection(connString)
sqlConn.Open()
Dim tblDatabases As DataTable = sqlConn.GetSchema("Databases")
sqlConn.Close()
For Each row As DataRow In tblDatabases.Rows
ListBox1.Items.Add(row("database_name"))
Next
End Using

I am doing this because I wanted the user to create the connection for the main application to use. Right now, i have a combobox with items, MyServ/SQLexpress and ./SQLExpress. I have a textbox and a listbox where the user will choose from the items from the listbox which will then display in the textbox.... I dont like to explicitly put in my code this
=.sqlExpress

In one of my button I have this code
builder("Data Source") = Me.cboDataSource.Text.Trim
builder("Integrated Security") = True
builder("Initial Catalog") = Me.txtDBName.Text.Trim
builder.ConnectTimeout = 30