if (!IsPostBack)  {    if(this.kjkm_dg.Attributes["SortExpression"]==null) //这里kjkm_dg为datagrid   ID    {     this.kjkm_dg.Attributes["SortExpression"]="kmdm";  //这里给datagrid增加一个排序属性，且默认排序表达式为kmdm;     kjkm_dg.Attributes["SortDirection"]="ASC"; //这里给datagrid增加一个排序方向属性,且默认为升序排列;    }    mikecatbind(); //绑定函数,下面介绍  }   protected void mikecatbind()  {   string sqlStr="select * from zc_kjkm";   DataView dv=new DataView();      string SortExpression=kjkm_dg.Attributes["SortExpression"];   string SortDirection=kjkm_dg.Attributes["SortDirection"];   dv=us.Bind(sqlStr).Tables[0].DefaultView;  //来自web service的dataset,这里随便一个ds就可以;   dv.Sort=SortExpression+" "+SortDirection; //指定视图的排序方式;   kjkm_dg.DataSource=dv; //指定数据源   kjkm_dg.DataBind(); //数据绑定  }

private void kjkm_dg_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)  {   string SortExpression=e.SortExpression.ToString();  //获得当前排序表达式   string SortDirection="ASC"; //为排序方向变量赋初值   if(SortExpression==kjkm_dg.Attributes   ["SortExpression"])  //如果为当前排序列   {    SortDirection=(kjkm_dg.Attributes["SortDirection"].ToString()==SortDirection?"DESC":"ASC");     //获得下一次的排序状态   }   kjkm_dg.Attributes["SortExpression"]=SortExpression;   kjkm_dg.Attributes["SortDirection"]=SortDirection;   mikecatbind();  }