DevForce Community Forum : Checking previous values of properties http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce Classic : Checking previous values of properties Thu, 11 Jun 2026 04:55:15 -700 Fri, 16 May 2008 10:25:07 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=808 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Checking previous values of properties : You can use the DataRowExtensions... http://www.ideablade.com/forum/forum_posts.asp?TID=808&PID=2966#2966 Author: jeffdoolittle
Subject: 808
Posted: 16-May-2008 at 10:25am

You can use the DataRowExtensions like this:

            Product p;
            string curValue = p.ProductName;
            string origValue = p.Field<string>(Product.ProductNameEntityColumn.ColumnName, DataRowVersion.Original);

or you can just use standard ADO.NET like this:

            Product p;
            string curValue = p.ProductName;
            string origValue = (string)p[Product.ProductNameEntityColumn.ColumnName, DataRowVersion.Original];

Of course, if you use ADO.NET like this, you'll have to perform your own DBNull checking if the column in question allows null values.

]]> Fri, 16 May 2008 10:25:07 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=808&PID=2966#2966 Checking previous values of properties : When I am about to save an object,... http://www.ideablade.com/forum/forum_posts.asp?TID=808&PID=2962#2962 Author: BillG
Subject: 808
Posted: 15-May-2008 at 10:30pm

When I am about to save an object, can I know if a field was changed and if so what was the previous value?
 
ex.  DuesRate.
 
I want to know if the user changed the dues rate during the edit process and I want to know what the previous value was to compare it to the new value.  I want to do this by looking at the object not intercepting the change event of the field and saving the value at the start of the edit.
 
Bill
 
]]> Thu, 15 May 2008 22:30:48 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=808&PID=2962#2962