C#: Disable button during search/calculation

Question

I have a search dialog where I want to disable the search button during the search. This is the current code but the button does not get deactivated

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Answer 1

This code must work.

private async void ExecuteSearch() {
        IsNotSearching = false;

        var task = Task.Factory.StartNew(() => {
            //do some searching here
        });
        await task;

        IsNotSearching = true;
    }