dynamic grid in ext.net

sample code her for dynamic grid
http://www.codeproject.com/script/Articles/ArticleVersion.aspx?aid=28065&av=41383


http://www.foscode.com/extjs-grid-search/


http://prres.wordpress.com/2010/03/11/extjs-grid-dynamic-columns/

http://forums.ext.net/showthread.php?4609-CLOSED-Dynamic-grid-column-format-string-and-performance


http://forums.ext.net/archive/index.php/t-254.html?s=7f8752c5b4f856948f25e7fbe1138115


http://www.foscode.com/extjs-grid-search/