create connection in local database

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VB

im try to create local database in vb.net. but i got error msg.
my code is like that
Imports System.Data.SqlClient
Imports System.Windows.Forms.Binding

Public Class Form1
Inherits System.Windows.Forms.Form
Dim ds As New DataSet
Dim da As New SqlDataAdapter
'Dim DBcon AS New Sqlconnection("Data Source=.\Initial_Catalog=Esaymarks;"& Integrated Security=true;asynchronous proccessing=true")
Private DBConn As New SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename="C:\Users\Amal\Documents\Visual Studio 2008\Projects\WindowsApplication11\WindowsApplication11\Database1.mdf";Integrated Security=True;User Instance=True")
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

End Sub
but error in this line
Data Source=.\SQLEXPRESS;AttachDbFilename="C
please correct this
thanks