Question

Guid mainfolderid = (main.GetValue(""));

where main is a dynamic entity.

How can I convert the above mentioned main.GetValue("") to System.Guid?

The error says

Cannot implicitly convert type object to ‘System.Guid’.

Answer 1

Does the GetValue method actually return a Guid typed as object? If so, then you just need to perform an explicit cast like so:

Guid mainfolderid = (Guid)main.GetValue("");

If not, does GetValue return something that can be passed to one of the constructors (ie, a byte[] or string)? In that case you could do this:

Guid mainfolderid = new Guid(main.GetValue(""));

If neither of the above are applicable then you’re going to need to do some manual work to convert whatever’s returned by GetValue to a Guid.