name 'X509Certificate2UI' does not exist in the current context

Question

Does anyone had problem using X509Certificate2UI class in an Asp Net MVC4 application

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;
    }
}

It complains that there is no 'X509Certificate2UI' name in the current context No idea since the class is in System.Security.Cryptography.X509Certificates;

Answer 1

You need to include reference for System.Security.dll into your project, since it is not included in the mscorlib assembly, but in the System.Security assembly.