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SuspendLayout and ResumeLayout only prevent OnLayout from being called. Additionally they only prevent OnLayout from being called for that particular control. So if you have a Form with a Panel in it, and call SuspendLayout on the Form, the Panel's layout is not suspended.

private void button1_Click(object sender, EventArgs e) {

this.Layout += new LayoutEventHandler(Form1_Layout);

panel1.Layout += new LayoutEventHandler(Panel1_Layout);

// Test one - calling PerformLayout here does not call Form1_Layout

this.SuspendLayout();

this.PerformLayout();

this.ResumeLayout(false);

// Test two - calling PerformLayout here calls Panel1_Layout

// Child controls are not suspended when the parent is suspended.

this.SuspendLayout();

panel1.PerformLayout();

this.ResumeLayout(false);