How to convert SQL TimeStamp

I have a field in my table of type TimeStamp. 
In my class i declare it as
public byte[] RowVersion { get; set; } I assign it to a hidden field as
RowHiddenField.Value = myObj.RowVersion.ToString(); I then try and compare it, in my method (using Linq to SQL) but the value is never matched.
How could i compare a timeStamp value in .Net? I've read a few articles suggesting to use Convert.ToBase64String but trying this didnt do the trick.