If you want your application to open the link in a web browser you need to add a HyperLink with the RequestNavigate event set to a function that programmatically opens a web-browser with the address as a parameter.
<TextBlock>
<Hyperlink NavigateUri="http://www.google.com" RequestNavigate="Hyperlink_RequestNavigate">
Click here
</Hyperlink>
</TextBlock>
In the code-behind you would need to add something similar to this to handle the RequestNavigate event:
private void Hyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e)
{
// for .NET Core you need to add UseShellExecute = true
// see https://docs.microsoft.com/dotnet/api/system.diagnostics.processstartinfo.useshellexecute#property-value
Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri));
e.Handled = true;
}
In addition you will also need the following imports:
using System.Diagnostics;
using System.Windows.Navigation;
It will look like this in your application: