public bool CreateFolder(
	string newFolderName,
	FolderId parentFolderId
)

Public Function CreateFolder ( 
	newFolderName As String,
	parentFolderId As FolderId
) As Boolean

Parameters

newFolderName

Type: SystemString
The folder name. Null reference (Nothing in Visual Basic) or empty string not allowed.

parentFolderId

Type: FolderId
The ID of the parent folder where to create the new folder. If a null reference (Nothing in Visual Basic), RootFolderType will be assumed.

Return Value

newFolderName must be a short name (not a full name with nested folder names in it). To create a folder by its full name, you'll need to create all levels separately (if they do not already exist).

Note
This method is not implemented in .NET Core. Use CreateFolderAsync(String, FolderId) instead.

Reference