internal static void FRIEND(string ns)
{
StackTrace trace = new StackTrace();
string text1 = trace.GetFrame(1).GetMethod().DeclaringType.Namespace;
string str = trace.GetFrame(2).GetMethod().DeclaringType.Namespace;
Assert(str.Equals(str) || str.Equals(ns), Environment.GetResourceString("RtType.InvalidCaller"), trace.ToString());
}