gridview的删除问题
<form id= "form1 " runat= "server ">
<div>
<asp:GridView ID= "GridView1 " runat= "server " AllowPaging= "True " AutoGenerateColumns= "False "
CellPadding= "4 " DataKeyNames= "id " ForeColor= "#333333 "
GridLines= "None " Style= "z-index: 100; left: 163px; position: absolute;
top: 104px " Width= "729px " CssClass= "adminlist " EnableViewState= "False " EmptyDataText= "没有你所查找的记录 " AllowSorting= "True " OnSelectedIndexChanged= "GridView1_SelectedIndexChanged " PageSize= "20 ">
<FooterStyle BackColor= "#507CD1 " Font-Bold= "True " ForeColor= "White " />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID= "chkSelect " runat= "server "/>
</ItemTemplate>
<HeaderTemplate>
<input id= "chkAll " onclick= "SelectAllCheckboxes(this); " runat= "server " type= "checkbox " />

</HeaderTemplate>
<ItemStyle HorizontalAlign= "Left " Width= "25px " />
</asp:TemplateField>



<asp:BoundField DataField= "btsrxm " HeaderText= "被投诉人姓名 " SortExpression= "btsrxm " >
<ItemStyle HorizontalAlign= "Left " VerticalAlign= "Middle " />
<HeaderStyle HorizontalAlign= "Left " />
</asp:BoundField>
<asp:BoundField DataField= "cddm " HeaderText= "车队 " SortExpression= "cddm " >
<ItemStyle HorizontalAlign= "Left " VerticalAlign= "Middle " />
<HeaderStyle HorizontalAlign= "Left " />
</asp:BoundField>
<asp:BoundField DataField= "tsxz " HeaderText= "投诉性质 " SortExpression= "tsxz " >
<ItemStyle HorizontalAlign= "Left " VerticalAlign= "Middle " />
<HeaderStyle HorizontalAlign= "Left " />
</asp:BoundField>
<asp:BoundField DataField= "tsnr " HeaderText= "投诉内容 " SortExpression= "tsnr " >

<ItemStyle HorizontalAlign= "Left " VerticalAlign= "Middle " />
<HeaderStyle HorizontalAlign= "Left " />
</asp:BoundField>
<asp:BoundField DataField= "tsrq " HeaderText= "投诉日期 " SortExpression= "tsrq " >
<ItemStyle HorizontalAlign= "Left " VerticalAlign= "Middle " />
<HeaderStyle HorizontalAlign= "Left " />
</asp:BoundField>
<asp:BoundField DataField= "jbr " HeaderText= "经办人 " SortExpression= "jbr " >
<ItemStyle HorizontalAlign= "Left " VerticalAlign= "Middle " />
<HeaderStyle HorizontalAlign= "Left " />
</asp:BoundField>
<asp:TemplateField ShowHeader= "False ">
<ItemTemplate>
<input ID= "id " name= ' <%# Eval( "ID ") %> ' type=hidden Value= ' <%# Eval( "ID ") %> ' />

<a href= "addfuwu.aspx?action=edit&id= <%# Eval( "ID ") %> " id= "a2 " > 修改 </a>
<a href= "addfuwu.aspx?action=view&id= <%# Eval( "ID ") %> " id= "a1 " > 查看 </a>

<asp:Button ID= "Button1 " runat= "server " CausesValidation= "False " CommandName= "Delete "
Text= "删除 "　OnClientClick= "return confirm( '您确认删除该记录吗? '); " />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate> 没有你所查找的记录 </EmptyDataTemplate>
<RowStyle BackColor= "#EFF3FB " />
<EditRowStyle BackColor= "#2461BF " />
<SelectedRowStyle BackColor= "#D1DDF1 " Font-Bold= "True " ForeColor= "#333333 " />
<PagerStyle BackColor= "#2461BF " ForeColor= "White " HorizontalAlign= "Center " />
<HeaderStyle BackColor= "#507CD1 " Font-Bold= "True " ForeColor= "White " />
<AlternatingRowStyle BackColor= "White " BorderStyle= "Groove " />
<EmptyDataRowStyle VerticalAlign= "Top " />
<PagerTemplate>



</PagerTemplate>
</asp:GridView>
 

</div>
<div style= "text-align:left ">
<br />

            
</div>

<table border= "1 " cellpadding= "0 " cellspacing= "0 " bordercolorlight= "#FFFFFF " bordercolordark= "#E6E6E6 " bgcolor= "#FFFFFF " style= "left: 190px; width: 73%; position: relative; top: -6px; height: 24px ">
<tr> <td style= "height: 24px; width: 200px; ">
<asp:Button ID= "Button2 " runat= "server " Text= "批量删除用户 " CommandName= "Delete " OnClientClick= "return confirm( '您确认删除该记录吗? '); " OnClick= "Button2_Click "/>
 
</td>
<td align=right style= "height: 24px; width: 325px; ">
<webdiyer:AspNetPager ID= "AspNetPager1 " runat= "server " Style= "position: relative " OnPageChanged= "AspNetPager1_PageChanged " PageSize= "20 " Width= "310px " FirstPageText= "首页 " LastPageText= " 末页 " NextPageText= "下一页 " PrevPageText= "上一页 ">
</webdiyer:AspNetPager>

   </td>
</tr> </table>
<asp:Label ID= "Label1 " runat= "server " Height= "20px " Style= "left: 47px; position: relative;
top: 58px " Text= "Label " Width= "87px "> </asp:Label>


</form>

[解决办法]
把if(!IsPostBack)去掉