asp.net 按钮事件获得页面<%for %>循环变量

C# code:

<%for (int i = 0; i < InsChEntyList.Count; i++)
{ %>
<tr bgcolor="#FFFFFF" onmouseover="this.style.background='#FFFDE2'; " onmouseout ="this.style.background='#fff'; this.style.borderColor='#fff'">
<td align="center"><%=InsChEntyList[i].GpsCode %></td>
<td align="center"><%=InsChEntyList[i].Testing_Time %></td>
<td align="center"><img src="images/<%=ExchangeToImg(InsChEntyList[i].IsLocate)%>.gif" width="13" height="12"></td>
<td align="center"><img src="images/<%=ExchangeToImg(InsChEntyList[i].IsMcu)%>.gif" width="13" height="12"></td>
<td align="center"><img src="images/<%=ExchangeToImg(InsChEntyList[i].IsLocked)%>.gif" width="13" height="12"></td>
<td align="center"><img src="images/<%=ExchangeToImg(InsChEntyList[i].IsUnLocked)%>.gif" width="13" height="12"></td>
<td align="center"><img src="images/<%=ExchangeToImg(InsChEntyList[i].AllPass)%>.gif" width="13"