asp:TextBox ReadOnly=true or Enabled=false?
What's the difference between the Enabled and the ReadOnly-properties of an asp:TextBox control?
If a control is disabled it cannot be edited and its content is excluded when the form is submitted.
If a control is readonly it cannot be edited, but its content (if any) is still included with the submission.
Another behaviour is that readonly = 'true' controls will fire events like click, buton Enabled = False controls will not.
Readonly will not "grayout" the textbox and will still submit the value on a postback.