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I Create many Form in my MainPanel Added To Panel by

Form1 frm = new Form1(this);
frm.TopLevel = false;
frm.AutoScroll = true;
frm.Dock = DockStyle.Fill;
frm.WindowState = FormWindowState.Maximized;

which event is running when i switch between forms?
i want to do job when user switch between forms
Updated 2-Sep-14 22:47pm

Can you try the following event?

private void Form1_Activated(object sender, System.EventArgs e)

this event should fire when ever the form is activated, that is focus is received on this form
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See the Windows Forms Events Lifecycle:

Move: This event occurs when the form is moved. Although by default, when a form is instantiated and launched, the user does not move it, yet this event is triggered before the Load event occurs.
Load: This event occurs before a form is displayed for the first time.
VisibleChanged: This event occurs when the Visible property value changes.
Activated: This event occurs when the form is activated in code or by the user.
Shown: This event occurs whenever the form is first displayed.
Paint: This event occurs when the control is redrawn.
Deactivate: This event occurs when the form loses focus and is not the active form.
Closing: This event occurs when the form is closing.
Closed: This event occurs when the form is being closed.

Refer the Link for details:[^]
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