Best technique for persisting program options

I'm using VS2005 C#.  I have a custom data grid that holds many date values.  If any date is within so many days from the current date, that cell is colored a specific color (such as yellow).  If any date on the grid is earlier than the system date that cell is colored a specific color (such as red).  The person using the program will determine their own color key,and their color key will be persisted with the data grid.  If the program is started for the first time, and there are no open files, there still has to be a default color key that comes with the program.  

My question is this:  what is the best way to persist the default color key.  Should it be in the registry or as a runtime class or some other method?
fly412sAsked:
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ripahoratiuConnect With a Mentor Commented:
The best way would be to have it coded into your application as follows:
1. I'm assuming that you've extended the datagrid and you have 2 properties Colour1 and Colour2
2. After putting the control in a form or whatever, set the two properties into Property Pane: in Data -> ApplicationSettings, PropertyBinding and search there for them. You can set the default value and the scope (per user or per application). Once you've set them check that the value of the properties are updated on any change in the XML repository (in designer DataBindings.Add(new System.Windows.Forms.Binding .... has the last parameter System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged)
3. Save the Apllication setting once you leave the form, or anytime the user modifies the colour.
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Si_HibbardCommented:
I would probably use an xml file to store app settings. Maybe this will help - example of using xml and datasets.

http://www.codeproject.com/dotnet/XMLSettingsFile.asp
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