C＃可选参数还是方法重载？ [重复]

public class Class1
{
    // Methods
    public Class1()
    {
        this.Method1(\"3\", \"23\");
    }

    public void Method1(string one, [Optional, DefaultParameterValue(\"23\")] string two)
    {
    }
}

.class public auto ansi beforefieldinit Class1
    extends [mscorlib]System.Object
{
    .method public hidebysig specialname rtspecialname instance void .ctor() cil managed
    {
        .maxstack 8
        L_0000: ldarg.0 
        L_0001: call instance void [mscorlib]System.Object::.ctor()
        L_0006: nop 
        L_0007: nop 
        L_0008: ldarg.0 
        L_0009: ldstr \"3\"
        L_000e: ldstr \"23\"
        L_0013: call instance void WebApplication1.Class1::Method1(string, string)
        L_0018: nop 
        L_0019: nop 
        L_001a: ret 
    }

    .method public hidebysig instance void Method1(string one, [opt] string two) cil managed
    {
        .param [2] = string(\'23\')
        .maxstack 8
        L_0000: nop 
        L_0001: ret 
    }

}

var foo = new Bar { Name = \"Fred\", Pet = \"Dino\" };