Combine return and switch in C#

Actually this is possible using switch expression starting with C# 8.

return a switch
{
    1 => "lalala",
    2 => "blalbla",
    3 => "lolollo",
    _ => "default"
};

Switch Expression
There are several syntax improvements here:

• The variable comes before the switch keyword. The different order
  makes it visually easy to distinguish the switch expression from the
  switch statement.
• The case and : elements are replaced with =>. It’s
  more concise and intuitive.
• The default case is replaced with a _
  discard.
• The bodies are expressions, not statements.

For more information and examples check:

• Microsoft’s C# 8 Whats New, and
• C# Switch Expression.