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Tip: How to pass initialize parameters to Silverlight application using <object> element? 

If you want to pass initialize parameters to Silverlight application from an HTML/ASPX page, you have to find the place where your Silverlight control is inserted into the page using the <object> element and insert the bold line bellow.

HTML

<object data="data:application/x-silverlight," type="application/x-silverlight-2-b2" width="100%" height="100%"> 

    ...

    <param name="initParams" value="param1=value1,param2=value2" />

    ...

</object>

As you can see you have to insert one new element <param name="initParams" value="parameters"/> as a child of the <object> element. The syntax for parameters definition is pretty straightforward - you just have to enumerate all parameters and their values separated by commas like this: "parameter1=value1,parameter2=value2,parameter3=value3". Once the initialize parameters have been defined, you can obtain them in your application startup event handler using the InitParams property of the StartupEventArgs like this:

C#

private void Application_Startup( object sender, StartupEventArgs e )

{

    //... Other code here ...

    string param1Value = e.InitParams[ "param1" ];

That's it!

http://www.silverlightshow.net/tips/How-to-pass-initialize-parameters-to-Silverlight-application-using-object-element.aspx