C#数据库问题

string connection = "Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind"; string sql = "select * from User"; public void Sqlconnection(string connection,string sql) { SqlConnection conn = new SqlConnection(connection); conn.Open(); SqlCommand comm = new SqlCommand(sql, conn); SqlDataReader read = comm.ExecuteReader(); while (read.Read()) { } read.Close(); conn.Close(); }