cmd.ExecuteNonQuery();括号附近有语法错误,错在哪里了？？

Question

FolderBrowserDialog dlg = new FolderBrowserDialog();
if (dlg.ShowDialog() != DialogResult.OK)
{
return;
}
string path = dlg.SelectedPath;
String connStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "delete from T_Numbers";
cmd.ExecuteNonQuery();
}
}
string[] files = Directory.GetFiles(path, "*.txt", SearchOption.AllDirectories);
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "insert into T_Numbers（StartNo,EndNo,Name） values (@StartNo,@EndNo,@Name)";

foreach (string file in files)
{
string 运营商名称 = 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 市 = strs[2];
cmd.Parameters.Clear();
cmd.Parameters.Add(new SqlParameter("StartNO", 开始号码));
cmd.Parameters.Add(new SqlParameter("EndNO", 结束号码));
cmd.Parameters.Add(new SqlParameter("Name", 运营商名称 + 市));
cmd.ExecuteNonQuery();
}
}

}
}

MessageBox.Show("导入成功");

Answer 1

using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "delete from T_Numbers";
cmd.ExecuteNonQuery();
//没有把连接对象con加给命令对象cmd，加一句
cmd.Connection=con;
}