cdo.message - C# CDO for Eventsink -

i have class a1 implementing ismtponarrival.

in public method

public void onarrival(message msg, ref cdoeventstatus eventstatus) {     string strfixedlist = msg.envelopefields["http://schemas.microsoft.com/cdo/smtpenvelope/recipientlist"].value.tostring();  } 

i writing nunit test event sink. in unit test method have private method pick , eml file , returns me cdo.message , object passed onarrival.

private cdo.message readmessage(string emlfilename) {     cdo.message msg = new cdo.messageclass();     adodb.stream stream = new adodb.streamclass();     ...     msg.datasource.openobject(stream, "_stream");     msg.datasource.save();     return msg; } 

when call public method

a1 b = new a1(); 

b.onarrival(msg, ref cdoevent);

an exception thrown in "msg.envelopefields["http://schemas.microsoft.com/cdo/smtpenvelope/recipientlist"]". can 1 please let me know issue?.

the exception "the requested property or feature, while supported, not available @ time or in context".

there work around , had flag set , if unit test hardcode envelope fields.

this working.