Make buttons available dynamically

Thanks for the help, with your help and research I got the desired result:

namespace teste3 {     public partial class Form1: Form     {         int Days;         int Schedules;

    private Button[][] botoes = new Button[3][];
    private GroupBox[] grupo = new GroupBox[3];

    int quantidade;

    public Form1()
    {
        InitializeComponent();
        botoes[0] = new Button[5] { btnA1, btnA2, btnA3, btnA4, btnA5 };
        botoes[1] = new Button[5] { btnB1, btnB2, btnB3, btnB4, btnB5 };
        botoes[2] = new Button[5] { btnC1, btnC2, btnC3, btnC4, btnC5 };

        grupo = new GroupBox[] { group_1, group_2, group_3 };
    }

    private void btn_Verificar_Click(object sender, EventArgs e)
    {
        Dias = int.Parse(text_Dias.Text);
        Horarios = int.Parse(text_Bancas.Text);
        EscondeBotoes();

        // Display the array elements:
        for (int i = 0; i < Dias; i++)
        {
            grupo[i].Visible = true;

            for (int j = 0; j < Horarios; j++)
            {
                botoes[i][j].Visible = true;
            }
        }
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void EscondeBotoes()
    {
        for (int i = 0; i < 3; i++)
        {
            grupo[i].Visible = false;

            for (int j = 0; j < 5; j++)
            {
                botoes[i][j].Visible = false;
            }
        }            
    }
}

}

If you want to show x TextBox , depending on a value, you can create an array to save them and assign the correct Visible to each through a loop. This way it gets a bit more flexible and easy to expand into more elements.

Example:

public partial class Form1 : Form
{
    private TextBox[] botoes; //array de textboxes

    public Form1()
    {
        InitializeComponent();

        //colocar no array as textboxes que quer e pela ordem certa
        botoes = new TextBox[] { textBox1, textBox2, textBox3 };
    }

    //este método mostra a quantidade de textboxes correspondente ao parametro passado
    private void Mostrar(int quantidade)
    {
        for (int i = 0; i < botoes.Length; ++i)
        {
            botoes[i].Visible = (i < quantidade) ? true : false;
        }
    }

So for what I had said

  

If I type 3 in the textbox, button 1, 2 and 3 will be visible

Just call the method with this value: Mostrar(3); .

Note that the same logic applies to Button or any other form element that works.