How to implement "Please wait "rogress bar while generating excel reports?..please help me ..thank'u'

For Response.write you need a full post back.

thanku..i am using ... but i get the following error masg while generating crystal reports.. Sys.WebForms.PageRequestManagerParserErrorException:The message received from the server could not be parsed. Common causes for this error are when the response are modified by calls to Response.write(), response filters, HTTPModules, or server trace is enabled. Details: Error Parsing near '%PDF - 1.4'.

Using Update Panel, UpdateProgress ... google/bing it for samples