A section allow you to specify a region of content within a layout. It expects one parameter which is the name of the section. If you don’t provide that, an exception will be thrown. A section in a layout page can be defined by using the following code.
@section header{
<h1>Header Content</h1>
}
You can render above defined section header on the content page as given below:
@RenderSection("header")
By default, sections are mandatory. To make sections optional, just provides the second parameter value as false, which is a Boolean value.
@RenderSection("header",false)
Note: A view can define only those sections that are referred to in the layout page otherwise an exception will be thrown.