Also, don't forget that IMC does not play well when either module has been placed in an AJAX UpdatePanel - either explicitely or by the module control being automatically wrapped in an UpdatePanel if "Supports Partial Rendering" has been enabled on the control in the module definition. Here's a bit more detail and an alternative for DNN 5.x anyway from Jon Henning:

http://www.dotnetnuke.com/Community/Blogs/tabid/825/EntryId/2074/Utilizing-the-Microsoft-AJAX-Framework-and-ClientAPI-to-Develop-Rich-Modules-Part-III.aspx

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

hi All,

First i would like to appologize for misunderstanding how DNN Works.

Second , thanks William for pointing me to correct my error where i have enabled Partial redering on my module.

The Communication between my modules worked fine when i removed the partial rendering.:)

Sorry again, it was my mistake.

Also i would like to know what did "Brandon Haynes" meant when he said : I recall it is performed very early in the control lifecycle. 

Regards

Elie