<CategoryAttribute("Behavior")>
<DescriptionAttribute()>
Public Event CustomFilter As CustomFilterEventHandler

Dim instance As WebGrid
Dim handler As CustomFilterEventHandler
 
AddHandler instance.CustomFilter, handler

[CategoryAttribute("Behavior")]
[DescriptionAttribute()]
public event CustomFilterEventHandler CustomFilter

public event CustomFilter: CustomFilterEventHandler; 

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

[CategoryAttribute("Behavior")]
[DescriptionAttribute()]
public: __event CustomFilterEventHandler* CustomFilter

[CategoryAttribute("Behavior")]
[DescriptionAttribute()]
public:
event CustomFilterEventHandler^ CustomFilter

private void WebGrid1_InitializeDataSource(object sender, ISNet.WebUI.WebGrid.DataSourceEventArgs e)
{
    oleDbDataAdapter1.Fill(dsNorthWind1.Products);
    e.DataSource = dsNorthWind1;
}

private void WebGrid1_InitializeLayout(object sender, ISNet.WebUI.WebGrid.LayoutEventArgs e)
{
     WebValueList wvalue = WebGrid1.RootTable.Columns.GetNamedItem("CategoryID").ValueList;
     if(!wvalue.IsDataCached())
     {
             oleDbDataAdapter2.Fill(dsNorthWind1.Categories);
             wvalue.DataSource = dsNorthWind1;
     }
     wvalue.DataMember = "Categories";
     wvalue.DataTextField = "CategoryName";
     wvalue.DataValueField = "CategoryID";
}

private void WebGrid1_CustomFilter(object sender, ISNet.WebUI.WebGrid.FilterEventArgs e)
{
     WebGridFilter filter;
     filter = e.FilterColumns.GetNamedItem("CategoryName");
     if (filter!=null)
     e.FilterColumns.Remove(filter);

     WebGridFilter oldFilter;
     oldFilter = e.FilterColumns.GetNamedItem("CategoryID");
     if (oldFilter!=null)
     {
         e.FilterColumns.Remove(oldFilter);
         filter = new WebGridFilter();
         filter.Table = oldFilter.Table;
         // remember to set column member field BEFORE FilterType and FilterText
         filter.ColumnMember = "CategoryName";
         filter.FilterType = oldFilter.FilterType;
         filter.FilterText = oldFilter.FilterText;
         e.FilterColumns.Add(filter);
      }
}