dynamic DLL loading

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I want to enable a button for some funtionality in my main application by
checking if a perticular assembly is installed or not. I have following
code --

Assembly a = Assembly.LoadFrom("DLLHello.dll");
Type[] myTypes = a.GetTypes();
BindingFlags flags = (BindingFlags.NonPublic | BindingFlags.Public |
BindingFlags.Static | BindingFlags.Instance | BindingFlags.DeclaredOnly);
foreach( Type t in myTypes )
{
ConstructorInfo[] ci = t.GetConstructors();
object obj = Activator.CreateInstance(t);
foreach(ConstructorInfo c in ci)
{
c.Invoke(obj,null);
}
}

Very much from MSDN but I am stuck after first foreach loop.

My problem is how to get instance of my class and all the methods inside it,
like I can get by ref at design time !!

Thanks
--
Po


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