The BeforeOutput event occurs after data has been selected from the database and ready to be sent to client-side.
connector.BeforeOutput += new EventHandler<RenderEventArgs>(connector_BeforeOutput);
Event passes reference to XmlWriter object that is currently used for rendering response.
Most common use-case of this event - the header structure for the grid.
void connector_BeforeOutput(object sender, RenderEventArgs e)
{
e.Writer.WriteStartElement("head");
{
//col 1
e.Writer.WriteStartElement("column");
{
e.Writer.WriteAttributeString("width", "50");
e.Writer.WriteAttributeString("type", "ed");
e.Writer.WriteAttributeString("align", "right");
e.Writer.WriteAttributeString("color", "white");
e.Writer.WriteAttributeString("sort", "na");
e.Writer.WriteString("Sales");
}
e.Writer.WriteEndElement();
}
//...............
}
In case of dyn. loading mode, one more check needs to be performed for preventing data output for additional data calls.
void connector_BeforeOutput(object sender, RenderEventArgs e)
{
if (this.Connector.Request.StartIndex == 0)
{
e.Writer.WriteStartElement("head");
//..........
}
}