Getting the value of textfield

Question

I have written a webform to edit a row in a sql database. When page loads it polulates data from the data into the textfields using the following fieldName.Text . I then use the same bit of code to get the edited value of the field. (fieldName.Text) This however is returning the original value which was populated into the field. How do I extract the value which the user inputs/edits. Cheers Paul