asp.net页面值丢失问题

[y63964632]

public partial class MsgSend : System.Web.UI.Page
{
UserInfo user = new UserInfo();
List<string> sendMobiles= new List<string>();
bool isUserAdd = false;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Btn1_Click(object sender, EventArgs e){
sendMobiles.Add("2222222222");
sendMobiles.Add("111111111111");
}
protected void Btn2_Click(object sender, EventArgs e){

}
protected void Btn3_Click(object sender, EventArgs e){
response.write(sendMobiles.toarray()[0].tostring());
}

}

如上代码：

页面上的一个list用来存储值，但是另个按钮打印值得时候，值丢失问题。

应该如何做？谢谢~

[孟子E章]

Btn1_Click你只是赋值，并没有进行保存，。
ViewState["x"] = sendMobiles;

Btn2_Click
sendMobiles = ViewState["x"] as List<string>;

protected void Btn1_Click(object sender, EventArgs e)
{
  sendMobiles.Add("2222222222");
  sendMobiles.Add("111111111111");
  ViewState["x"] = sendMobiles;
}
protected void Btn2_Click(object sender, EventArgs e)
{
  sendMobiles = ViewState["x"] as List<string>;
  Response.Write(sendMobiles.ToArray()[0]);
}

这跟CS结构的程序是不同的

[y63964632]

谢谢 ~