help me to resolve this error

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.NET

here is my code. and error of "is a field but used like method" error is comingin the AttachmentCollection.



if (AttachmentCollections.ContainsKey(activityid)) {
Hashtable Attachments = default(Hashtable);
Attachments = AttachmentCollections(activityid);

DictionaryEntry this_entry = default(DictionaryEntry);
Hashtable this_attachment = default(Hashtable);

foreach ( this_entry in Attachments) {
this_attachment = this_entry.Value;

delete_attachment(Convert.ToInt32(this_attachment["AttachmentID"]));
}
}