C# applect param pass problem

[aw1ay]

I insert an object(object is writed as winform user control whin c#) in a webform I want to pass some param to the object I define the object like this now I want to pass the param to the object with the user selected path because the param value is depends on the user selection so How can I pass the Param to the object? I used js like this AnimTool.Path = " df" but when I open it ,it reports js cann't found the AnimTool object AnimTool is not define. why,how?