哪错了。各位大侠帮一下
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Configuration;
using System.Data.SqlClient;

namespace 手机号码归属地
{
  public partial class Form1 : Form
  {
  public Form1()
  {
  InitializeComponent();
  }

  private void btnImport_Click(object sender, EventArgs e)
  {
  FolderBrowserDialog dlg = new FolderBrowserDialog();
  if (dlg.ShowDialog() != DialogResult.OK)
  {
  return;
  }
  string path = dlg.SelectedPath;

  string connstr = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
  SqlConnection conn = new SqlConnection(connstr);
  conn.Open();
  SqlCommand cmd = new SqlCommand();
  cmd.Connection = conn;
  cmd.CommandText = "delete from number";
  cmd.ExecuteNonQuery();
  conn.Close();
  string[] files=Directory.GetFiles(path,"*.txt",SearchOption.AllDirectories);
  SqlCommand cmd1 = new SqlCommand();
  conn.Open();
  cmd1.Connection = conn;
  cmd1.CommandText = "insert into number(StaNO,EnON,Name) values (@StaNO,@EnON,@Name) ";

  foreach (string file in files)
  {
  string 运营商 = Path.GetFileNameWithoutExtension(file);
  string[] lines = File.ReadAllLines(file, Encoding.Default);
  foreach (string line in lines)
  {
  string[] strs = line.Split('-');
  string 开始号码 = strs[0];
  string 结束号码 = strs[1];
  string 姓名 = strs[2];
  cmd1.Parameters.Clear();
  cmd1.Parameters.Add(new SqlParameter("StaON", 开始号码));
  cmd1.Parameters.Add(new SqlParameter("EndON", 结束号码));
  cmd1.Parameters.Add(new SqlParameter("Name", 运营商 + 姓名));
  cmd1.ExecuteNonQuery();----------- 提示：必须声明标量变量 "@StaNO"。

  }
  cmd1.Clone();
  cmd1.Dispose();
  }
  MessageBox.Show("数据导入成功");
  }
  }
}


------解决方案--------------------
cmd1.CommandText = "insert into number(StaNO,EnON,Name) values (@StaNO,@EnON,@Name) ";

cmd1.Parameters.Add(new SqlParameter("StaON", 开始号码));



------解决方案--------------------
cmd1.Parameters.Add(new SqlParameter("@StaON", 开始号码));
cmd1.Parameters.Add(new SqlParameter("@EndON", 结束号码));
cmd1.Parameters.Add(new SqlParameter("@Name", 运营商 + 姓名));
 
------解决方案--------------------
cmd1.CommandText = "insert into number(StaNO,EnON,Name) values (@StaNO,@EnON,@Name) ";
cmd1.Parameters.Add(new SqlParameter("StaON", 开始号码)); 
改为
cmd1.Parameters.Add(new SqlParameter("StaNO", 开始号码));