Preventing ValueChanged to fire for all rows when column header Checkbox is clicked

Hello Patrick,

The ValueChanged event will be called when a cell changed its value. When the header checkbox check state is changed, this will change the cell values in this column and it is expected this event to be called for each cell. You can consider using the CellValueChanged event. The second event will be called when a cell changed its value and the focus moves away. In the event handler, you can check the ActiveEditor property from the event arguments. This property will be null when the user clicks on the cell header checkbox. You can check this and execute your custom logic there.

this.radGridView1.CellValueChanged += RadGridView1_CellValueChanged; ;
            this.radGridView1.HeaderCellToggleStateChanged += RadGridView1_HeaderCellToggleStateChanged;

private void RadGridView1_CellValueChanged(object sender, GridViewCellEventArgs e)
{
    if(e.ActiveEditor == null)
    {
// Custom logic
    }
}

private void RadGridView1_HeaderCellToggleStateChanged(object sender, GridViewHeaderCellEventArgs e)
{
          
}

Can you try this approach and let me know if it works for you? If not you share some more details regarding your requirement and I will think of a more suitable solution.

Regards,
Dinko | Tech Support Engineer
Progress Telerik