The Drop Down List should be configured to look like the ASP. The Data Source ID for the Drop Down List points at Customer IDData Source.
The code to retrieve Data Key value in the Data Bound event of details View control is given below.It is the Edit Item Template you are interested in.The Edit Item Template will contain Text Box controls by default. To String(); We can use the above code in the Data Bound event of the Detila View control to retrieve the Data Keys.An old friend of mine, Joe Shook, laughingly said, you should read what other people write too once in a while. Of course, he was right and naturally I do. I read almost everything I can get in my hands including technical books, blogs, and articles because I am surprised by the number of things I haven't mastered or that I still don't have a best practices sort of solution for. Thankfully I am still willing to stay up to 11 or 12 o'clockused to be until the next morningworking out the details of what I don't know until I am happy with an answer.