还要在private void InitializeComponent()方法中(此方法在#region Web Form Designer generated code中)添加:
this.datagrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.datagrid_PageIndexChanged);
this.datagrid1.SelectedIndexChanged += new System.EventHandler(this.datagrid1_SelectedIndexChanged);