Display data from database into textbox that matches listbox values

[Vishal Rane]

Suppose der is one database name Customer which have columns like Cust_ID,Cust_Name,Cust_Mob,Cust_Address

And on Form der are one list box which contains all Cust_Id from database
and 4 textbox
so when user click on the listbox having id as 1 it should display name, mob and address of cust_id 1 in 4 textbox respectively pls help me asap........
This is what i have done so far

1. Private Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
2. dbSource = "Data Source=xx-B4C521B850\SQLEXPRESS;Initial Catalog=TT;Integrated Security=True"
4. con.ConnectionString = dbSource
5. con.Open()
6. sql = "Select Cust_Fn from Cust where Cust_Id='" & ListBox1.Text & "' "
7. da = New SqlClient.SqlDataAdapter(sql, con)
8. da.Fill(ds, "Cust")
9. con.Close()
11. TextBox1.Text = ds.Tables("Cust").Rows(0).Item(0)
12. End Sub'

Thanks in advance....