Sometimes passing values to methods can be quite unreadable. Booleans, integers and other constants aren't always clear without digging into the signature.

Named arguments lets you optionally put the parameter name next to the value.

Additionally when a method has Optional arguments ^{C# 4.0} they are used to specify which arguments are being passed without having to specify default values or nulls.

Code

Now

GetCustomer(id: 1, eager: true, depth:3);

// (Show use of optional arguments too)
Customer getCustomer(int id, bool eager, Context context = null, int depth = 0)
{
    // ...
}

Before

GetCustomer(1, true, null, 3);

Customer getCustomer(int id, bool eager, Context context, int depth)
{
    // ...
}

More information

• C# Programming Guide