更改ASP.NET标识提供程序的连接字符串

我有一个使用ClaimSidentity的WebForms应用程序(不是MVC)。我希望动态地切换连接字符串,但我看不到这样做的方法。我在网上看到的所有关于MVC的参考资料。这是我的代码:

Dim userStore As New UserStore(Of IdentityUser)
Dim roleStore As New RoleStore(Of IdentityRole)
Dim userManager As New UserManager(Of IdentityUser)(userStore)
Dim roleManager As New RoleManager(Of IdentityRole)(roleStore)

Dim userName As String = identity.Claims.First(Function(claim) claim.Type = ClaimTypes.WindowsAccountName).Value 

是否仍要更改正在使用的连接字符串,而不是在web.config文件中找到的默认连接字符串?

编辑

我试着创建这个类,其来源是:

Imports System.Data.Entity
Imports Application.Common
Imports Application.Data.Migrations
Imports Application.Models
Imports Microsoft.AspNet.Identity.EntityFramework

Namespace Application.Data
    Public Class ApplicationDbContext
        Inherits IdentityDbContext(Of IdentityUser)

        Public Sub New(ByVal stringName As String)
            MyBase.New(stringName, throwIfV1Schema:=False)
        End Sub


        Public Shared Function Create(ByVal stringName As String) As ApplicationDbContext
            Return New ApplicationDbContext(stringName)
        End Function

        Public Overloads Function [Set](Of TEntity As Class)() As IDbSet(Of TEntity)
            Return MyBase.[Set](Of TEntity)()
        End Function
    End Class
End Namespace

然后,我这样做:

Dim newContext As ApplicationDbContext = New ApplicationDbContext("test")

Dim userStore As New UserStore(newContext)
Dim roleStore As New RoleStore(newContext)
Dim userManager As New UserManager(Of IdentityUser)(userStore)
Dim roleManager As New RoleManager(Of IdentityRole)(roleStore)

但是,变量userstore和rolestore的一个错误“到很少的争论到‘userstore’…”

编辑

创建这样的管理者是有效的:

 Dim userStore = New UserStore(Of IdentityUser)(New ApplicationDbContext("DefaultConnection1"))
 Dim roleStore = New RoleStore(Of IdentityRole)(New ApplicationDbContext("DefaultConnection1"))