计算一段程序运行的时间

protected void Button1_Click(object sender, EventArgs e)

{

Stopwatch stw = new Stopwatch();

stw.Start();

using (SqlConnection sqlcnn=new SqlConnection(sqlstr))

{

using (SqlCommand sqlcmm=sqlcnn.CreateCommand())

{

sqlcnn.Open();

sqlcmm.CommandText = "select * from users where id=1002222";

SqlDataReader reader = sqlcmm.ExecuteReader();

while (reader.Read())

{

Response.Write("id为：" + reader[0].ToString());

stw.Stop();

Response.Write(" 用时为：" +stw.Elapsed.Milliseconds.ToString()+"毫秒");

}

sqlcnn.Close();

}

}

}