DB/Reporting :: Unicode Characters Showing As '?'

I have developed an application and need to allow users to enter text in any language and save it to my database. However the text is saved as '?' in my database. I have googled quite a bit and found that people have suggested not to use varchar, text types but use nvarchar and ntext etc in your database. I have gone through and made these changes to my database. However it still saved text as '?', I then found people where saying about adding 'N' infront of the text prior to saving into the database. The problem is that I cannot figure out how to do this in a stored procedure.

Stored Procedure

Code:
CREATE PROCEDURE [dbo].[spUpdateActionTaken] @ID as varChar(4),@action as text,@modifyDate as varchar(50)
AS
UPDATE commentsTbl SET commActionTaken=@action,modifyDate=@modifyDate WHERE [ID]=@ID

Note: Fields commActionTaken set to nText

VB.Net Code

Code:
Dim actionTaken as String = Me.textBox.Text
Dim myCmd As New OleDb.OleDbCommand("spUpdateActionTaken")
myCmd.CommandType = CommandType.StoredProcedure

[code].....