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The Page class has a Page property which it inherits from the Control class. This property returns a reference to the Page instance that contains the server control i.e. the current Page instance itself.
So, in other words, for code within _Default or any other sub-class of Page, all the following should do the same thing:
Response.Redirect(url);
this.Response.Redirect(url);
Page.Response.Redirect(url);
this.Page.Response.Redirect(url);
Accepted