.cs 文件代码如下：

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, "删除成功,共删除" + count + "条记录！");
  }
}
catch
{
  MessageBox.Show(this, "删除失败！");
}
finally
{
  con.Close();
  con.Dispose();
}
}