Granularity (one field, one control) :
A definition of databing could be having a link between the field in the datasource and a control.
When we talk about data binding, the first thing that should come to mind, is that we are binding fields to controls. In more detail, when we use a GridView to bind it to a table, in fact we are binding each field in the database to a specific control, present in the form of a collection, which makes us say, we are binding a table to the grid, while the granular aspect of it is that we are binding many fields to many controls.
Binding Scripting Syntax for Grids, Datalists, Formviews and detailviews:
Two way binding (very popular)
<%1: # Bind("fieldname")%>
One way Binding (ReadOnly)
<%1: # Eval("fieldname")%>
Another one is :
<%1: # DataBinder.Eval(Container.DataItem, "fieldname")%>
This are helper Functions. Here's how they work :
when we have a textbox inside a TemplateField, in a Gridview : We have the following Syntax :
<asp:TextBox id="txtName" runat="server" Text='<%# Bind("Name") %>' />
In fact, The Bind Method is executed during the ItemDataBound Event (one popular event in the 1.1 DataGrid control used to initilize child controls in a GridView). The Bind method helps not having to write code behind syntax to bind each field during insert and update.