Add controls dynamically in flowlayoutpanel

For a FlowLayoutPanel, you don't need to specify a location since the controls are arranged for you. Just change "this" to the name of your FlowLayoutPanel:

for (int i = 0; i < 5; i++)
{
    Button button = new Button();
    button.Tag = i;
    flowLayoutPanel1.Controls.Add(button);
}

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Populating a FlowLayoutPanel with a large number of controls and painting thumbnails on demand

To improve the speed of populating the FlowLayoutPanel with your user controls, disable layout updating while you add the controls.

Immediately before your loop, call SuspendLayout() and then at the end call ResumeLayout(). Make sure to use a try-finally to guarantee the ResumeLayout() runs even if an exception occurs.