Winform不用窗体之间传值

1 先构建一个类，内容如下：

namespace TravelForm
{
public sealed class Setting
{
private static volatile Setting instance;
private static object syncRoot = new Object(); private Setting() { }
public static Setting Instance
{
get
{
if (instance == null)
{
lock (syncRoot)
{
if (instance == null)
instance = new Setting();
}
}
return instance;
}
} public string UserName; }
}

2 在窗体1中赋值:

Setting m_set = Setting.Instance;

m_set.UserName = "test";

3 在窗体2 中 取值：

Setting m_set = Setting.Instance;
string request = m_set.UserName;