<DescriptionAttribute()>
<CategoryAttribute("Behavior")>
Public Event CustomAggregate As CustomAggregateEventHandler

Dim instance As WebGrid
Dim handler As CustomAggregateEventHandler
 
AddHandler instance.CustomAggregate, handler

[DescriptionAttribute()]
[CategoryAttribute("Behavior")]
public event CustomAggregateEventHandler CustomAggregate

public event CustomAggregate: CustomAggregateEventHandler; 

In JScript, you can handle the events defined by another class, but you cannot define your own.

[DescriptionAttribute()]
[CategoryAttribute("Behavior")]
public: __event CustomAggregateEventHandler* CustomAggregate

[DescriptionAttribute()]
[CategoryAttribute("Behavior")]
public:
event CustomAggregateEventHandler^ CustomAggregate

private void WebGrid1_CustomAggregate(object sender,
ISNet.WebUI.WebGrid.CustomAggregateArgs e)
{
    if (e.Column.DataMember == "Status") 
    {
        WebGridRowCollection rows = e.Rows;
        int count = 0;
        for (int i=0; i < rows.Count; i++) 
        {
            WebGridCell cell = rows[i].Cells[e.Column.Position];
            if (cell.Value.ToString() == "Active")
            {
                count++;
            }
        }
        e.AggregateResult = count;
    }
}