C#单例模式

//全局唯一的单例
public static Form2 FrmSingle=null;

private Form2()
{
InitializeComponent();
}

public static Form2 GetSingle()
{
if (FrmSingle == null)
{
FrmSingle = new Form2();
}
return FrmSingle;

namespace _TEST_
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
Form2 frm2 = Form2.GetSingle();//new Form2();
frm2.Show();
}
}
}