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This will allow us to add the appropriate interfaces to the module class.

To implement the interface that will allow us to fire the event, implement the IModuleCommunicator interface:

partial class ViewDMBSample :
    PortalModuleBase,
    IActionable,
    IModuleCommunicator
{

To implement the interface that will allow a module to listen for the event, implement the IModuleListener interface:

partial class ViewDMBSample :
    PortalModuleBase,
    IActionable,
    IModuleListener
{

To fire the event from your IModuleCommunicator module, you'll need to call ModuleCommunication(this, ModuleCommunicationEventArgs).

The first parameter will pass a pointer to the module object with the event.  You could use this to pull specific information from it using properties or methods you may have implemented on the module.  Keep in mind that if you want to use properties or methods from the module, it is best to implement an interface that you can apply to the module so that when the listener gets the object, you can cast the sender to the interface rather than trying to cast it to the ASCX object, which doesn't always work.

The second property is a DotNetNuke object that you will create and stuff with the following properties:

Once you have fired the message, the listener will need to pick it up.  You do this by implementing the OnModuleCommunication method.
<

span style="color: blue;">public void  OnModuleCommunication(
    object s, ModuleCommunicationEventArgs e)
{
    // Do something with the message here.
}

Other places talking about IMC:

DotNetNuke Inter-Module Communication or: How Your Modules Can Get ... - If you have been writing your own DotNetNuke modules for any amount of time you have probably run across the concept of Inter-Module Communication (IMC for short). IMC particularly refers to the facility that the DotNetNuke framework ...

Inter Module Communication in DNN using C# - Well, this post I will share with you my finding about the DNN IMC, something like you want to pass 1 or more values from one module to another module, imagine you created 2 modules, one is search module another one is result list ...

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