Public Overridable Function OnCustomAggregate( _
   ByVal col As WebGridColumn, _
   ByVal rows As WebGridRowCollection, _
   ByVal type As String _
) As Object

Dim instance As WebGrid
Dim col As WebGridColumn
Dim rows As WebGridRowCollection
Dim type As String
Dim value As Object
 
value = instance.OnCustomAggregate(col, rows, type)

public virtual object OnCustomAggregate( 
   WebGridColumn col,
   WebGridRowCollection rows,
   string type
)

public function OnCustomAggregate( 
    col: WebGridColumn;
    rows: WebGridRowCollection;
    type: String
): TObject; virtual; 

public function OnCustomAggregate( 
   col : WebGridColumn,
   rows : WebGridRowCollection,
   type : String
) : Object;

public: virtual Object* OnCustomAggregate( 
   WebGridColumn* col,
   WebGridRowCollection* rows,
   string* type
) 

public:
virtual Object^ OnCustomAggregate( 
   WebGridColumn^ col,
   WebGridRowCollection^ rows,
   String^ type
) 

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