Can't get signals to work

Question

I have a class named SignalOrigin.cs and another class named EmitSignalTest.cs
The signal however is not found! ( I am new to Godot C# )
Here is the code:
( SignalOrigin.cs )

    [Signal]
    delegate void CreateBlock();

    public void ABlock()
    {
        GD.Print("HELLO");

    }

    public override void _Ready()
    {
        this.Connect(nameof(CreateBlock), this, "ABlock");
    }

( EmitSignalTest.cs )

if (Input.IsActionJustPressed("ui_accept"))
        {
            if(Materials[0] > 0)
            {
                EmitSignal("CreateBlock");
            }
        }

Comments

The EmitSignal method and the signal delegate have to be in the same class.

The Signal then shows in the editor. Form there you can choose the target node/script.

That should help you: https://docs.godotengine.org/en/stable/getting_started/step_by_step/signals.html

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Thank you, very much! For the first time I didn't understand the docs. Thank you for your help!