C# WPF Change Resource On Click -


my xaml here:

<window.resources>     <xmldataprovider x:key="rsssource" xpath="//item" source="https://news.google.com/news?output=rss" /> </window.resources>

i need change when button click event:

<window.resources>     <xmldataprovider x:key="rsssource" xpath="//item" source="change textbox value" /> </window.resources>

how can it?

like maybe

       xmldataprovider provider = (xmldataprovider) this.findresource("rsssource");        provider.source = new uri("change textbox value");

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