public static void MainX()
{
var p = new MyStruct { X = 1, Array=new int[3]};
ProcessStruct(p);
Console.WriteLine(p.Array[0]);
}
static void ProcessStruct(MyStruct p)
{
p.Array[0] = 100;
}
static void ProcessStruct(MyStruct p)
{
p.Array[0] = 100;
}