Hi Yapwen,
Thank you for contacting Syncfusion support,
We have analyzed your query. By default SfDataGrid does not update the summaries at runtime. You need to set LiveDataUpdateMode to either AllowSummaryUpdate or AllowDataShaping. Please refer the below code snippet.
Codesnippet[XAML]:
<syncfusion:SfDataGrid x:Name="datagrid"
AutoGenerateColumns="True"
ItemsSource="{Binding Employees}" LiveDataUpdateMode="AllowDataShaping"/>
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Could you please ensure that you have set LiveDataUpdateMode in your sample application? .We have prepared the sample based on this and you can download it from following location,
Sample Location: SfDataGridSample_SummaryUpdate.zip
Please refer the documentation link for the same,
Documentation Link: http://help.syncfusion.com/ug/wpf/Documents/datamanipulation.htm
If still you are facing an issue with updating summaries after setting LiveDataUpdateMode, please share the sample or modify the based on your application and revert to us. It would be helpful for us to provide you the better solution.
Regards,
Saravanan.M