How do I call a method in a Master Page from a content’s code-behind page?

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From within the Page you can cast the Master page to a specific type (the type of your own Master that exposes the desired functionality), using as to side step any exceptions on type mismatches:

var master = Master as MyMasterPage;
if (master != null)
{
    master.Method();
}

In the above code, if Master is not of type MyMasterPage then master will be null and no method call will be attempted; otherwise it will be called as expected.

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