We recently had a need to handle communication between an existing windows service (Running on client machines) and the current ASP.Net web application that we are working on. We chose to implement this feature using .Net Remoting and an ActiveX Control that would live on one of our aspx pages.
Implementing an ActiveX control in VS2005 using C# isn't difficult, but there are a lot of little issues that a co-worker and I encountered along the way.
I'll try and list the results of my research and a walk-through of creating a sample project. This will probably span several posts.
The steps that I will cover... Check it out HERE!
1. Create a C# Web Application project
2. Create a Windows Control Library project
a. Note: The Windows Control Library DLL file must be located in the same directory as the aspx page and NOT in the bin folder.
3. Add a user control item to the class library project
a. Creating the user control
b. Implement an Interface on your user control that will exposes members, methods, and events of your user control to COM
4. Create an object in your aspx page that embeds your user control
5. Handle communication between your web application and your ActiveX control using JavaScript
6. Expose and raise/handle user control events using javascript
7. A brief overview of configuring the .Net Framework and zone permissions to allow your web application and ActiveX control to communicate
8. Configuration issues with IIS (set to allow scripts only, not scripts and exes)
9. How to view IE7 error messages to get the exact exception that might be causing you problems.
Check it out HERE!
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