public void Insert ()
{
X509CertificateCollection c = new X509CertificateCollection ();
c.Add (x509a);
Assert.AreEqual (0, c.IndexOf (x509a), "a=0");
c.Add (x509c);
Assert.AreEqual (1, c.IndexOf (x509c), "c=1");
c.Insert (1, x509b);
Assert.AreEqual (1, c.IndexOf (x509b), "1");
Assert.AreEqual (2, c.IndexOf (x509c), "2");
}