名字& # 39;X509Certificate2UI& # 39;在当前上下文中不存在

是否有人在asp.net MVC4应用程序中使用X509Certificate2UI类有问题

using System.Security.Cryptography.X509Certificates;

private static X509Certificate2 PickCertificate(StoreLocation location, StoreName name)
{
    try
    {
        store.Open(OpenFlags.ReadOnly);
        //PROBLEM IS HERE
        X509Certificate2 cert = X509Certificate2UI.SelectFromCollection(store.Certificates, "Caption", "Message", X509SelectionFlag.SingleSelection)[0]; 
}
    catch (Exception)
    {               
        throw;
    }
}

它抱怨在当前上下文中没有'X509Certificate2UI'名称不知道，因为该类在System.Security.Cryptography.X509Certificates;