public static void Insert(this X509ExtensionCollection exts, Int32 index, X509Extension extension)
{
if (extension == null)
{
throw new ArgumentNullException(nameof(extension));
}
if (exts == null)
{
return;
}
if (index < 0 || index >= exts.Count)
{
throw new OverflowException();
}
List <X509Extension> e = new List <X509Extension>(exts.Cast <X509Extension>());
e.Insert(index, extension);
exts = new X509ExtensionCollection();
exts.AddRange(e);
}