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 List field = new List();
    protected void Page_Load(object sender, EventArgs e)
    {

        //加载CSS样式表
        WebLoader.LoadCSS(this, "BasicStyle.css");
        WebLoader.LoadCSS(this, "Search.aspx.css");

        field.Add("User_Status");
        field.Add("User_Email");
        field.Add("User_State");
        field.Add("User_RealName");
        field.Add("User_Point");

        if (!Page.IsPostBack)
        {
            this.Bind();   //调用上面的BindToGridView()绑定
        }
    }

    protected void Bind()
    {
        IUserBLL userBLL = BLLFactory.CreateUserBLL();
        IList result = userBLL.GetByFieldAndPage(field[DropDownListField.SelectedIndex], this.tbKeyword.Text.Trim(), 1, 10);

        this.GridViewSearchResult.DataSource = result;
        this.GridViewSearchResult.DataBind();
    }

    protected void btnSearch_Click(object sender, EventArgs e)
    {
        Bind();
       

    }

    protected void GridViewSearchResult_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        this.GridViewSearchResult.PageIndex = e.NewPageIndex;
        this.Bind();   //调用上面的BindToGridView()绑定
    }