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In Razor you can create blocks of code nearly anywhere using @{ }.

A block of code doesn’t emit anything into the output, but you can use the block to manipulate a model, declare variables, and set local properties on a view. Be extremely careful about having too much code in a view, however, because it’s not the best place for logic.

@{
    var message = "Hello, World!";
}
  
@for (var i = 0; i < 10; i++)
{
    <div>
        @message
    </div>
}

If you want to mix Code & Text then you must use @:

Use @: to switch from C# into text.

@foreach(var item in Model)
{
    @:Item: @item
}

Comments in Razor can start with @* and end with *@. Nothing inside a comment will execute or appear in the output, not even HTML markup.

@* 
  <span>You won't see any of this</span> 
  @foreach(var item in Model) { 
    @:Item: @item 
  } 
*@