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Checking previous values of properties
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BillG View Drop Down
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Joined: 05-Dec-2007
Location: Monroe, MI
Posts: 233 		Post Options Post Options   Quote BillG Quote  Post ReplyReply Direct Link To This Post Topic: Checking previous values of properties
    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
 
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jeffdoolittle View Drop Down
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Joined: 14-Jun-2007
Location: United States
Posts: 146 		Post Options Post Options   Quote jeffdoolittle Quote  Post ReplyReply Direct Link To This Post 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.
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