Ext.NET Web Application Development
A walkthrough – creating a simple ASP.NET project with Ext.NET enabled
A walkthrough – creating a simple ASP.NET MVC Project with Razor and Ext.NET enabled
Further resources and examples
AJAX options specific to certain controls
Ultimate performance option: avoid AJAX!
Many more GridPanel capabilities not covered here
Binding Stores and Records to a form
Extending Ext.NET – Custom Controls and Plugins
Plugins versus extending components