With expression

• with expression produces a copy of its operand with the specified properties and fields modified
• You use object initializer syntax to specify what members to modify and their new values.
• C# 10 supports with expressions for all structs, including record structs, as well as for anonymous types.
• In the case of a reference-type member, only the reference to a member instance is copied when an operand is copied. Both the copy and original operand have access to the same reference-type instance.

public struct Point 
{
	public Point(double x, double y) {
		X = x;
		Y = y;
	}
	public double X { get; init; }
	public double Y { get; init; }
	public override string ToString() => $"({X}, {Y})";
}
//struct type
var p1 = new Point(10, 10);
var p2 = p1 with { Y = 12 };
Console.WriteLine(p1);
Console.WriteLine(p2);

//anonymous type
var a1 = new { X = 10, Y = 10} ;
var a2 = a1 with {X = 12 };
Console.WriteLine(a1);
Console.WriteLine(a2);

Example