方法一：   
DataTable dt = dataSet.Tables[0];   
for(int i = 0 ; i < dt.Rows.Count ; i++)   
{   
   string strName = dt.Rows[i]["字段名"].ToString();   
}   
  
方法二：   
foreach(DataRow myRow in myDataSet.Tables["temp"].Rows)   
{   
      var str = myRow[0].ToString();   
}   
  
方法三：   
foeach(DataRow dr in dt.Rows)      
{      
     object value = dr["ColumnsName"];      
}   
  
方法四：   
DataTable dt=new DataTable();      
foreach(DataRow dr in dt.Rows)      
{    
   for(int i=0;i<dt.Columns.Count;i++)    
   {    
dr[i];    
   }      
}   
  
绑定DataTable到Reapter。   
if (dtb_xx.Rows.Count > 0)   
        {   
            rp_xx.DataSource = dtb_xx;   
            rp_xx.DataBind();   
        }    
<asp:Repeater ID="rp_xx" runat="server">   
       <ItemTemplate>   
            <tr>   
                  <td>   
                      <div>   
                            <ul class="ListHorizontally">   
                                 <li>   
                                      <div class="TCell1">   
                                            <%#Eval("ID")%>   
                                       </div>   
                                  </li>   
                                  <li>   
                                       <div class="TCell2">   
                                             <%#Eval("Name")%>   
                                        </div>   
                                  </li>   
                            </ul>   
                       </div>   
                    </td>   
                </tr>   
            </ItemTemplate>   
         </asp:Repeater>   
方法五
DataRow[] dataRows = null;
dataRows = dataTable.Select(fieldParentID + "='" + treeNode.Tag.ToString() + "'", dataTable.DefaultView.Sort);
foreach (DataRow dataRow in dataRows)
{ 

     DataRow dataRow = dataTable.Rows[i]; 

     ?? = dataRow[fieldParentID].ToString();
}