Improve performance by using explicit cast instead of DataBinder.Eval
The DataBinder.Eval method is often used when you want to bind data to a control's template. What DataBinder.Eval really does is to cast Container.DataItem to its specific type, like this:
<%# DataBinder.Eval(Container.DataItem, "Heading") %>
DataBinder.Eval uses .NET reflection in order to cast Container.DataItem to its specific type. The use of reflection in this method will give you a performance loss.
If performance is of importance in your application or if you know what type Container.DataItem is, it's better to use an explicit cast instead:
<%# ((DbDataRecord)Container.DataItem)["Heading"] %>