สร้างตัวติดตั้งโปรแกรม ติดตั้งเครื่องได้ แต่ database ไม่มีขึ้น เออเร่อ คะ SQL Express

Public Class SqlDBConn
    Public Shared strConn As String = "Server=.\SqlExpress;AttachDBFileName = C:\DBProject.mdf;Database=DBProject.mdf;Trusted_connection=yes"

End Class

Imports System.Data.SqlClient
Imports WindowsApplication2.SqlDBConn
Imports System.Text

Public Class FrmPurchases

    Dim cn As New SqlConnection(strConn)
    Dim sql As String = ""
    Dim FlagAction As String = ""
    Dim dr As SqlDataReader
    Dim cm As New SqlCommand
    Dim strSql As String = ""
    Dim tr As SqlTransaction
    Dim dt As New DataTable
    Dim ds As New DataSet
    Dim num As Integer = 0
end class