Winforms - Fill user control inside panel

Question

I am new to winforms, what i am trying to do is a simple form:

• In my form there is a panel.

• The panel is linked to a user control

• The user control should fill the panel.

This is my form:

public Form1()
    {
        InitializeComponent();

        UserControl1 userControl = new UserControl1();

        panel1.Controls.Add(userControl);
        userControl.Anchor = ((AnchorStyles)((((AnchorStyles.Top | AnchorStyles.Bottom)
     | AnchorStyles.Left) | AnchorStyles.Right)));
        userControl.Dock = DockStyle.Fill;
    }

Not working -> the control doest stretch

Answer 1

Try this,

    public Form1()
    {
        InitializeComponent();
        panel1.Dock = DockStyle.Fill;
        UserControl1 userControl = new UserControl1();
        userControl.Dock = DockStyle.Fill;
        panel1.Controls.Add(userControl);

    }

userControl.Dock = DockStyle.Fill; should call before Add to panel1.

You also need to set Anchor property of controls inside UserControl to stretch it based on usercontrol stretch in panel.

Like.

Public Sub UserControl1()

        //This call is required by the designer.
        InitializeComponent();

        //Add any initialization after the InitializeComponent() call.
        Label1.Anchor = AnchorStyles.Top;
        Label2.Anchor = AnchorStyles.Right;
        Label4.Anchor = AnchorStyles.Bottom;
        Label3.Anchor = AnchorStyles.Left;
    End Sub

Note: userControl.Dock = DockStyle.Fill; stretch only usercontrol it self not controls inside user control. To stretch controls of user control you need to set Dock as well as Anchor property accordingly.

Answer 2

You need to dock your user control as well. Docking panel makes it to dock to the form but not the UserControl.

userControl.Dock = DockStyle.Fill;