Event handlers between 2 web user controls

[vbshyam]

I have an 2 web user controls (ascx1, ascx2). ascx1 has a date control (Text box and calender img button). ascx2 has 2 dates, start date and end date. I am using ascx1 in ascx2 for dates. The tag name for ascx1 in ascx2 is ctrldt and the id for start date is ctrlstart and Id for end date is ctrlend. I need an event to be fired on change of start date in ascx2. I am new to .net and can any one please help me by providing the steps to create an event for this scenario. Thank you in advence.