asp.net實現批量刪除實例

<asp:GridView ID="GridView1" runat="server" Width="100%" EmptyDataText="暫時無數據" BorderColor="White" OnRowDeleting="GridView1_RowDeleting">
<Columns>
<asp:TemplateField HeaderText="選擇">
<ItemStyle Width="20px" />
 <ItemTemplate>
 <asp:CheckBox id="id" runat="Server" />
 </ItemTemplate>
 </asp:TemplateField>
 <asp:BoundField DataField="id" HeaderText="序號" >
 <ItemStyle Width="20px" />
 </asp:BoundField>
 <asp:TemplateField HeaderText="標題">
 <ItemStyle Width="400px" />
 <ItemTemplate>
 <a href="../shangpu/<%#eval_r("pageurl") %>" target="_blank"><%#eval_r("title") %></a>
 </ItemTemplate>
 </asp:TemplateField>
 <asp:TemplateField HeaderText="發表時間">
 <ItemStyle Width="100px" />
 <ItemTemplate>
 <%# Convert.ToDateTime(eval_r("addtime")).Date.ToString("yyyy-MM-dd") %>
 </ItemTemplate>
 </asp:TemplateField>
 <asp:HyperLinkField DataNavigateUrlFormatString="shangpu_edit.aspx?id={0}" Text="修改" NavigateUrl="shangpu_edit.aspx?id={0}" DataNavigateUrlFields="id" >
 <ItemStyle Width="30px" />
 </asp:HyperLinkField>
 <asp:CommandField ShowDeleteButton="True" HeaderText="刪除" DeleteText="<div id="de" onclick="JavaScript:return confirm('確定刪除嗎？')">刪除</div>" >
 <ItemStyle Width="30px" />
 </asp:CommandField>
 </Columns>
 <EmptyDataTemplate>
 <font color=red>暫時無數據</font>
 </EmptyDataTemplate>
<RowStyle Height="20px" />
 </asp:GridView>
 

protected void btndeleteall_Click(object sender, EventArgs e)
{
string sqltext = "(";
for (int i = 0; i < GridView1.Rows.Count; i++)
{
 CheckBox chb = (CheckBox)GridView1.Rows[i].FindControl("id");
 if (chb.Checked)
 {
 sqltext = sqltext + GridView1.DataKeys[i].Value.ToString() + ",";
 }
}
sqltext = sqltext.Substring(0, sqltext.Length - 1) + ")";
sqltext = "delete from shangpu where id in" + sqltext;
string sqlcon = ConfigurationManager.AppSettings["ConnectionString"].ToString();
SqlConnection con = new SqlConnection(sqlcon);
con.Open();
SqlCommand cmd = new SqlCommand(sqltext, con);
try
{
 int count = Convert.ToInt32(cmd.ExecuteNonQuery());
 if (count > 0)
 {
 viewbind();
 MessageBox.Show(this, "刪除成功,共刪除" + count + "條記錄！");
 }
}
catch
{
 MessageBox.Show(this, "刪除失敗！");
}
finally
{
 con.Close();
 con.Dispose();
}
}