How can I know if a non-required RenderSection exists?

@* Omitted code.. *@
@RenderBody()
@RenderSection("Sidebar", required: false)

Is there any way to know in the Omitted code part if the RenderSection Sidebar exists or not?

Answers:

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Method 1

@if (IsSectionDefined("Sidebar"))
{
    @RenderSection("Sidebar")
}
else
{
    <div>Some default content</div>
}

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