ItemDataBound

void BindGrid()
{
        DataTable dt = new DataTable();
        DataRow dr;
        dt.Columns.Add(new DataColumn("我是日期", typeof(DateTime)));
        dt.Columns.Add(new DataColumn("俺也是日期", typeof(DateTime))); 
        dt.Columns.Add(new DataColumn("偶也是日期啊,怎么我还带着时间?",typeof(DateTime)));
        for (int i = 0; i < 10; i++) 
        {
            dr = dt.NewRow();
            dr[0] = DateTime.Now;
            dr[1] = DateTime.Now;
            dr[2] = DateTime.Now;  
            dt.Rows.Add(dr);
        }
        dg.DataSource= dt;
        dg.DataBind();
}
void Page_Load(object o, EventArgs e)
{
    if(!IsPostBack)
    {
        BindGrid();
    }
}
void ItemDataBound(object o , DataGridItemEventArgs e)
{
    if(e.Item.ItemType==ListItemType.Item ||e.Item.ItemType==ListItemType.AlternatingItem )
    {
        DataRowView drv = (DataRowView)e.Item.DataItem;
        for(int i=0;i<e.Item.Cells.Count;i++)
        {     
            e.Item.Cells[i].Wrap =    false;
            string columnName=drv.Row.Table.Columns[i].ColumnName;
            if( columnName.StartsWith("我") )
            {
                e.Item.Cells[i].Text = ((DateTime)drv[columnName]).ToString("yyyy-MM-dd");
                //也可以这样
                //e.Item.Cells[i].Text = DataBinder.Eval(e.Item.DataItem,columnName,"{0:yyyy-MM-dd}");
            }
            if( columnName.StartsWith("俺") )
            {
                e.Item.Cells[i].Text = ((DateTime)drv[columnName]).ToString("dd/MM/yy");
                //也可以这样
                //e.Item.Cells[i].Text = DataBinder.Eval(e.Item.DataItem,columnName,"{0:yy-MM-dd}");
            }
        }
    }
}