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private void Form1_Load(object sender, EventArgs e)
{
    //FlowLayoutPanel上のコントロールの折り返しを有りに設定
    flowLayoutPanel1.WrapContents = true;
}

private void RadioButton_CheckedChange(object sender, EventArgs e)
{
    switch (((RadioButton)sender).Name)
    {
        case "radioButton_LeftToRight":
            flowLayoutPanel1.FlowDirection = FlowDirection.LeftToRight;
            break;

        case "radioButton_TopDown":
            flowLayoutPanel1.FlowDirection = FlowDirection.TopDown;
            break;

        case "radioButton_RightToLeft":
            flowLayoutPanel1.FlowDirection = FlowDirection.RightToLeft;
            break;

        case "radioButton_BottomUp":
            flowLayoutPanel1.FlowDirection = FlowDirection.BottomUp;
            break;
    }
}