/// <summary>Determines whether the specified <see cref="T:System.Type" /> can be deserialized with the <see cref="T:System.Runtime.Serialization.Formatters.TypeFilterLevel" /> property set to Low.</summary>
 /// <param name="t">The <see cref="T:System.Type" /> to check for the ability to deserialize. </param>
 /// <param name="securityLevel">The <see cref="T:System.Runtime.Serialization.Formatters.TypeFilterLevel" /> property value. </param>
 /// <exception cref="T:System.Security.SecurityException">The <paramref name="t" /> parameter is an advanced type and cannot be deserialized when the <see cref="T:System.Runtime.Serialization.Formatters.TypeFilterLevel" /> property is set to Low. </exception>
 public static void CheckTypeSecurity(Type t, TypeFilterLevel securityLevel)
 {
     if (securityLevel == TypeFilterLevel.Full)
     {
         return;
     }
     FormatterServices.CheckNotAssignable(typeof(DelegateSerializationHolder), t);
     FormatterServices.CheckNotAssignable(typeof(ISponsor), t);
     FormatterServices.CheckNotAssignable(typeof(IEnvoyInfo), t);
     FormatterServices.CheckNotAssignable(typeof(ObjRef), t);
 }