How to call the form inside another - Visual Studio

Question

I have the parent form with a Trip menuStrip. I’ve already set him up as isMdiContainer = True

And I have another form I call Services.

In the event MenuStrip > Service I put this:

frmCadastroServico CadastroServico = new frmCadastroServico();
CadastroServico.StartPosition = FormStartPosition.CenterParent;
CadastroServico.Show();

But still it doesn’t open inside the main but a new window, how can I fix it?

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The child form of this size is being opened:

Answer 1

You need to set the parent form (Parent) of your new form:

Example:

frmCadastroServico CadastroServico = new frmCadastroServico();
CadastroServico.StartPosition = FormStartPosition.CenterParent;
CadastroServico.MdiParent = this; // < - Adicione isto
CadastroServico.Show()

To make it maximized:

CadastroServico.WindowState = FormWindowState.Maximized;
CadastroServico.Dock=DockStyle.Fill;

To hide buttons maximize and minimize:

CadastroServico.MaximizeBox = false;
CadastroServico.MinimizeBox = false;