How To Store A Multi-line Textbox In MS SQL?

Hello,
I'm a newbie and I have a little problem that's starting to work on my nerves
 
I want to store a multi line textbox in the database, just like the way it has been entered.

I used a varbinary-field.
This is my code in my aspx
                Dim myOptions As New InterTyp.Opties()
                Dim myCon As SqlConnection = myOptions.getCon()
                Dim cmdOef As SqlCommand
                Dim parmOef As SqlParameter
               
                cmdOef = New SqlCommand("GetOef", myCon)
                cmdOef.CommandType = CommandType.StoredProcedure
                cmdOef.Parameters.Add("@oid", System.Data.SqlDbType.Int).Value = ID

                'output
                parmOef = cmdOef.Parameters.Add("@otext", SqlDbType.VarChar)
                parmOef.Size = 8000
                parmOef.Direction = ParameterDirection.Output

                'execute the query
                myCon.Open()
                cmdOef.ExecuteNonQuery()
                txtOef.Text = cmdOef.Parameters("@otext").Value
                myCon.Close()
In my code i call a sp:
CREATE PROCEDURE dbo.GetOef
             @oid integer,
             @otext varchar Output
AS
             SELECT  otext
             FROM oefening
             WHERE     (oid = @oid)
 
So my problem is:
How do i cast the varbinary back to a text?