Gridview中Dropdownlist的刷新有关问题

Gridview中Dropdownlist的刷新问题
因为要动态增加行,所以上网找了好久,才找到神贴
http://www.cnblogs.com/psforever/archive/2011/02/23/1963207.html
但是因为我这里面要用到Dropdownlist,数据绑定没做起来,就做成了静态的ListItem,目前功能基本实现,但是每次增加行的时候,Dropdownlist内容又恢复原始状态,实在搞不定了,求教各位大神!
如果能帮小弟动态绑定Dropdownlist,感激不尽!

页面代码:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="zlgcSYS.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>GridView中实现动态动态增加删除行</title>
    <style type="text/css">
        .hide{
            display:none;  
         }
    </style>
    <script type="text/javascript">
        //选中所有行
        function SelectAll(chkAll)
        {
            var gridview = document.getElementById("GridView1");
            if (gridview)
            {
               //获取到GridView1中的所有input标签
               var inputs = gridview.getElementsByTagName("input");
               for(var i=0;i<inputs.length;i++)
               {
                  if (inputs[i].type=="checkbox")
                  {
                     //设置所有checkbox的选中状态与chkAll一致
                     inputs[i].checked = chkAll.checked;
                  }
               }
            }
       }
     
       //给选中行换背景色
       function checkRow(chkRow)
       {
          var row = chkRow.parentNode.parentNode;
          if(row)
          {
               if (chkRow.checked)
                   row.style.backgroundColor="#7799CC";
                else
                   row.style.backgroundColor="#FFFFFF";
           }
       }
    </script>
</head>
<body>
    <form id="form1" runat="server">
   <div>
       <asp:LinkButton ID="lbtnAddRow" runat="server" Width="80px" OnClick="lbtnAddRow_Click">添加行</asp:LinkButton>
      <asp:LinkButton ID="btnDeleteRow" runat="server" OnClick="btnDeleteRow_Click" OnClientClick="return confirm('确定要删除选中行吗?');">删除选中行</asp:LinkButton>
   </div>
    <div>
        <asp:GridView ID="GridView1" runat="server"  AutoGenerateColumns="False" 
            CellPadding="4" ForeColor="#333333" 
            onrowdatabound="GridView1_RowDataBound">
            <Columns>
                <asp:BoundField DataField="ID" HeaderText="ID" >
                    <ItemStyle CssClass="hide" BorderColor="#507CD1" />
                    <HeaderStyle CssClass="hide" />
                </asp:BoundField>
                <asp:TemplateField HeaderText="序号">
                    <ItemTemplate>
                        <%# Container.DataItemIndex + 1%>
                    </ItemTemplate>
                    <ItemStyle BorderColor="#507CD1" HorizontalAlign="Center" BorderWidth="1px" />
                </asp:TemplateField>
                <asp:TemplateField>
                    <HeaderTemplate>
                       <input id="chkAll" type="checkbox" onclick="SelectAll(this)" />
                    </HeaderTemplate>
                    <ItemTemplate>
                        <input id="chkRow" type="checkbox" onclick="checkRow(this);" runat="server" />
                    </ItemTemplate>
                    <ItemStyle Width="30px" HorizontalAlign="Center" BorderColor="#507CD1" BorderWidth="1px" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="经费项目">
                    <ItemTemplate>
                        <asp:DropDownList ID="ddlxm" runat="server" AutoPostBack="True"> 
                            <asp:ListItem>调研差旅费</asp:ListItem>
                            <asp:ListItem>管理费</asp:ListItem>
                            <asp:ListItem>会议费</asp:ListItem>
                            <asp:ListItem>劳务费</asp:ListItem>
                            <asp:ListItem>设备购置和使用费</asp:ListItem>
                        </asp:DropDownList>
                    </ItemTemplate>
                    <ItemStyle Width="100px" BorderColor="#507CD1" BorderWidth="1px" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="经济科目">
                    <ItemTemplate>
                        <asp:DropDownList ID="ddlkm" runat="server" AutoPostBack="True"> 
                            <asp:ListItem>印刷费</asp:ListItem>
                            <asp:ListItem>咨询费</asp:ListItem>
                            <asp:ListItem>劳务费</asp:ListItem>
                            <asp:ListItem>差旅费</asp:ListItem>
                            <asp:ListItem>邮电费</asp:ListItem>
                            <asp:ListItem>专用设备购置费</asp:ListItem>
                            <asp:ListItem>会议费</asp:ListItem>
                        </asp:DropDownList>
                    </ItemTemplate>
                    <ItemStyle Width="100px" BorderColor="#507CD1" BorderWidth="1px" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="输入金额">
                    <ItemTemplate>
                        <asp:TextBox ID="txtje" runat="server" Text='<%# Bind("je") %>' BorderStyle="None"></asp:TextBox>
                    </ItemTemplate>
                    <ItemStyle Width="100px" BorderColor="#507CD1" BorderWidth="1px" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="支出说明">
                    <ItemTemplate>
                        <asp:TextBox ID="txtsm" runat="server" Text='<%# Bind("sm") %>' BorderStyle="None"></asp:TextBox>
                    </ItemTemplate>
                    <ItemStyle Width="100px" BorderColor="#507CD1" BorderWidth="1px" />
                </asp:TemplateField>
            </Columns>
            <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        </asp:GridView>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
    </div>
    </form>
</body>
</html>

------解决思路----------------------
或者你可以视每一行为一个对象,所有创建一行,就是创建一个对象,显示再显示此对象内容即可:
http://www.cnblogs.com/insus/p/3247935.html

Gridview中Dropdownlist的刷新有关问题