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Preventing the User from Removing the Initial Groups, Changing their Order, or Adding New Groups


Product Telerik UI for ASP.NET Core Grid
Progress Telerik UI for ASP.NET Core version Created with the 2023.3.1010 version


How can I prevent the user from moving the initially added groups of the Grid, changing their order, or adding new groups?


  1. Create a Grid with initial groups.
  2. Handle the Group event of the Grid.
  3. Within the Group event handler, get the current Grid groups by using the group() method of the DataSource.
  4. Check if the number of initial groups matches the number of current groups and if the first initial group matches the current first group and prevent the default event action if this condition is not met.

            .Events(ev => ev.Group("onGroup"))
            .DataSource(dataSource => dataSource
                .Group(groups => 
                    groups.Add(p => p.UnitsInStock);
                    groups.Add(p => p.UnitsOnOrder);
        @addTagHelper *, Kendo.Mvc
        <kendo-grid name="grid" on-group="onGroup">
            <datasource type="DataSourceTagHelperType.Ajax">
                    <group field="UnitsInStock"></group>
                    <group field="UnitsOnOrder"></group>
                <!-- Other configuration -->
            <groupable enabled="true" />
            <!-- Other configuration -->
            function onGroup(e) {
                var currentGroups =; // Get the current groups.
                if(currentGroups.length > 0) {
                    if((currentGroups.length != e.groups.length) || (currentGroups[0].field != e.groups[0].field)) { 
                        // Prevent the Group event.

For a runnable example based on the code above, refer to the following REPL samples:

More ASP.NET Core Grid Resources

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