You can reuse the Silverlight control if you have not deleted the assembly containing it. It should still work.
Also, on the aspx host page, add runat="server" and id to the <params ...> :
<params runat="server" id="initParams" name="initParams" />
In the code located in the Page_Load(...) method, you can:
this.initParams = "myKey1=something,myKey2=whatever...";
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