HtmlPage.Document.QueryString param value differs from DocumentUri.OriginalString value

HtmlPage.Document.QueryString param value differs from DocumentUri.OriginalString value

I have a strange problem with request param value. Silverlight application is opened inside aspx page. Problem appears when my queryString contains equals sign. I inspected values in silverlight application and found out that value from uri differs from value retrieved as queryString parameter:

HtmlPage.Document.DocumentUri.OriginalString:

"http://localhost:8081/SilverlightContainer.aspx?sys_ObjectId=2&sys_Param1={\"p1\":\"Narud\\u017Ebenica =\"}" 

HtmlPage.Document.QueryString["sys_Param1"]:

"{\"p1\":\"Narud\\u017Ebenica "   

If sys_Param1 doesn't contain equals sign everything works as expected.

Thanks.

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