public string system_update_column_family(CfDef cf_def)
{
#if !SILVERLIGHT
send_system_update_column_family(cf_def);
return recv_system_update_column_family();
#else
var asyncResult = Begin_system_update_column_family(null, null, cf_def);
return End_system_update_column_family(asyncResult);
#endif
}
#if SILVERLIGHT