Change content of a form without having to open another in C #

By manipulating UserControl (s) you can create an object inherited from Control . So, create your form in this UserControl and make it work as a Form.

After this, create a% client_config that will display the pages, and declare the controls as in the example below:

public UserControlHome ucHome = new UserControlHome();
public UserControlCripto ucCripto = new UserControlCripto();

And create this method to change the Panel that is in Control client Panel :

public void AlterarConteudo(ref Control controle) {
    // considere 'conteudo' o Panel que irá ter os controles dentro
    conteudo.Controls.Clear(); // - remove os controles dentro do Panel
    { // altera propriedades do controle que irá ser colocado
        controle.Dock = DockStyle.Fill;
    }
    // adiciona o controle ao cliente
    conteudo.Controls.Add(controle);
}

And when you click on the Encryption button, call the method with the expression:

AlterarConteudo(ref ucCripto);

And for the Home button:

AlterarConteudo(ref ucHome);

  

Remember to implement a method to save information in controls by being discarded .