public FolderId FindFolderIdByFullName(
	string folderFullName
)

Public Function FindFolderIdByFullName ( 
	folderFullName As String
) As FolderId

Parameters

folderFullName

Type: SystemString
The full folder name, such as "Inbox/Nested folder/Deeply nested folder". Null reference (Nothing in Visual Basic) or empty string not allowed.

Return Value

To delimit levels of hierarchy in the folder name, use the same character which is set by FolderLevelDelimiter property. By default, it's '/' (forward slash).

Key difference of this method from DownloadFolderByFullName(String) is that it returns just ID. This means that MailBee requests less info from the server making this method a bit more efficient. However, if you need the detailed info about the folder (e.g. message count, unseen count, etc), use DownloadFolderByFullName(String) instead.

Note
Scanning the entire folder tree is an expensive operation. If your Exchange account has thousands of folders, consider optimizations like those provided by FindFolderIdByFullName(FolderId, string) or FindFolderIdByFullName(string, int) overloads.

Note
This method is not implemented in .NET Core. Use FindFolderIdByFullNameAsync(String) instead.

Reference