public void SenderMethod()
{
TestEventArg tt = new TestEventArg();
tt.a = "E";
tt.b = "Q";
tt.c = 1234;
Console.WriteLine($"Before Value List : {tt.a}, {tt.b}, {tt.c}");
OnChangedSomething?.Invoke(this, tt);
Console.WriteLine($"After Value List : {tt.a}, {tt.b}, {tt.c}");
}
private void Ss_OnChangedSomething(object sender, TestEventArg e)
{
e.a = "ABCD";
e.b = "aaaa";
e.c = 1000;
}