clientdata.cs, C# - rextester

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using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Assignment
{
    public class CustomerDetails{
        public string connection = ConfigurationManager.ConnectionStrings["Con"].ConnectionString;
        public void get_details()
        {
            
            
            SqlConnection con = new SqlConnection(connection);
            con.Open();
            string query = "Select * from customer_details";
            SqlCommand cmd=new SqlCommand(query, con);
            SqlDataReader r = cmd.ExecuteReader();
          
            while (r.Read())
            {
                Console.WriteLine("Customer ID : "+ r[0].ToString());
                Console.WriteLine("Customer Name : " + r[1].ToString());
                Console.WriteLine("Phone Number : " + r[2].ToString());
                Console.WriteLine("Email id : " + r[3].ToString());
                Console.WriteLine("City : " + r[4].ToString());
            }
            con.Close();
        }
        public void get_details_dataset()
        {
            SqlConnection con = new SqlConnection(connection);
            con.Open();
            string query = "Select * from customer_details";
            SqlCommand cmd = new SqlCommand(query,con);
            SqlDataAdapter s = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            s.Fill(ds, "customer_details");
            foreach (DataRow r in ds.Tables["customer_details"].Rows)
            {
                Console.WriteLine("Customer ID : " + r[0].ToString());
                Console.WriteLine("Customer Name : " + r[1].ToString());
                Console.WriteLine("Phone Number : " + r[2].ToString());
                Console.WriteLine("Email id : " + r[3].ToString());
                Console.WriteLine("City : " + r[4].ToString());
            }

con.Close();

}

}
}

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