c# – How important is the use of the word "this"?

Question:

What is the real use of using the reserved word this ?

From what I see, it doesn't matter whether you use it or not, but I have doubts about its functionality.

Answer:

this serves to reference the object itself.

There are cases where its use becomes necessary.

class Pessoa {
    private string nome;

    public Pessoa(string nome){
        this.nome = nome;
    }
}

In the example above if I didn't use this , I would be referring to the parameter and not the class name property.

And others in which its use becomes optional:

class Pessoa {
    private string _nome;

    public Pessoa(string nome){
        // como não existe nenhuma variável "_nome" neste escopo, ele vai buscar o atributo da classe
        _nome = nome;
    }
}