protected void rep_Topic_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        DataRowView dr = (DataRowView)e.Item.DataItem;
                           dr["你的字段"]  
}

------解决方案--------------------
在前台中
<%# GetDString(Eval(startTime),Eavl(EndTime)) %>


public string GetDString(object StarTime,Object EndTime)
{
 DateTime dt=DataTime.Now.ToString("yyyy-MM-dd");
 if(判断条件)                   
 {
   ReTurn "未开始";
 }
 else if(判断条件)                   
 {
   ReTurn "正在进行";
 }

 else if(判断条件)                   
 {
   ReTurn "已经结束";
 }
 else
    ReTuen "":
}

------解决方案--------------------
   protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
   {
       if (e.Row.RowType == DataControlRowType.DataRow)  
       {
           DataRowView dr = (DataRowView)e.Row.DataItem;
           string starttime = dr["starttime"].ToString();
           string endtitme = dr["endtitme"].ToString();
           DateTime date = DateTime.Now;
           //处理
           e.Row.Cells[0].Text = "dd";
       }
   }