[ASP.NET]

 public static int iA;
    protected void Button1_Click(object sender, EventArgs e)
    {
            //Label1.Text

            Response.Write("该变量的值为"+iA.ToString());
            iA++;

    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)//只在页面第一次加载的时候运行意思
        {
            iA = ;
            Response.Write("该变量的值为" + iA.ToString());

        }

    }