Asp.net 与SQL server的连接

我正在尝试在SQL server和asp.net之间建立连接（vb代码）。我的SQL server名称是（本地） 我的vb代码是：

Imports System.Data
Imports System.Data.Sql
Imports System.Configuration
Imports System.Data.SqlClient

Imports System.Web
Imports System.Web.UI
Imports System.Web.Security
Imports System.Web.UI.WebControls
Imports System.Web.UI.HtmlControls
Imports System.Web.UI.WebControls.WebParts

Partial Class _Default
    Inherits System.Web.UI.Page

    Public cn As New SqlConnection
    Public cmd As New SqlCommand
    Public da As SqlDataAdapter
    Public dr As SqlDataReader
    Public ds As DataSet = New DataSet
    Public sql As String = Nothing
    Public ConString As String = ("Data Source=(local);Initial Catalog=dbSQL;Integrated Security=True") 'this is connected to the server


    Public Sub MyCn()
        If cn.State = Data.ConnectionState.Open Then cn.Close()
        cn.ConnectionString = ConString
        cn.Open()
    End Sub

但错误消息不断出现，即：

无法打开登录请求的数据库“dbSQL”。登录失败。 用户“window8\windows8”登录失败

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请帮助

确保将window8\windows 8用户添加到允许的帐户，并在所需的数据库中添加此用户的登录项。见此：