for eg. if the constructor for the control you want to load looks like this

public myUserControl (string s, bool b, int i){// constructor code here}

// as you can see there are 3 arguments for the constructor.
// One thing to be careful about is that you need to pass the arguments in
the same order they are
// listed in your constructor, and the type of the objects in your object
array should match,
// so as in the following code.

object[] myParameters = {"test", true, 3};

myUserControl c1 = LoadControl(myUserControl, myParameters);

Regards,
Alessandro Zifiglio
http://www.AsyncUI.net