GetBytes method for Text, NText, or Image not for nvarchar?

Question

The GetBytes function can only be used on columns of type Text, NText, or Image but not for nvarchar datatype.

 

byte[] outbyte = new byte[dr.GetBytes(dr.Getordinal["Notes"], 0, null, 0, 0)];

long y = dr.GetBytes(dr.Getordinal["Notes"], 0, outbyte, 0, 1000);

encodedtext = Encoding.UTF8.GetString(outbyte);

 

exception i got is The GetBytes function can only be used on columns of type Text, NText, or Image but not for nvarchar datatype.

 

Note: Here "Notes" column is a nvarchar type.