Hello Matthew,

I am just checking if you have any other questions regarding the sorting functionality of XamDataGrid.

Matthew, 

Thank you for the details you have provided information. I understand that you are changing values of the existing data items not adding new ones. The sorting is applied when the grid loads and default sorting description is added or when user interact sort it using the SortIndicator. It does not re-sort when data item is changed because it is not notified that it have to. You could sort a column at runtime by setting the IsSorted property after data is modified. Please note that if the SortDirection is already set the same value e.g. Descending, you should first change it to None or Ascending and then to Descending. Here is a code snippet that demonstrates how this could be achieved on button click:

private void Button_Click_1(object sender, RoutedEventArgs e)

        {

            DataUtil.Products.ElementAt(5).ProductID = -29;

            TextColumn customSortColumn = xamGrid1.Columns[0] as TextColumn;

            customSortColumn.IsSorted = SortDirection.None;

            customSortColumn.IsSorted = SortDirection.Descending;          

        }

I hope this will help you.

Your example worked on my end indeed.  However, I think my problem stems from the fact that I'm not adding new items to the grid like you are doing.  I have the same items in the grid but I'm updating them at the rate of around every 16.7 milliseconds.  So as the grid works now I can see all the items being updated.  They just need to resort themselves every time the items change.  Does that make sense?