Connection Class

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;

namespace Connection_Class
{
    public class Connection_Query
    {

        string ConnectionString = "";
        SqlConnection con;

        public void OpenConection()
        {
            con = new SqlConnection(ConnectionString);
            con.Open();
        }


        public void CloseConnection()
        {
            con.Close();
        }


        public void ExecuteQueries(string Query_)
        {
            SqlCommand cmd = new SqlCommand(Query_,con);
            cmd.ExecuteNonQuery();
        }


        public SqlDataReader DataReader(string Query_)
        {
            SqlCommand cmd = new SqlCommand(Query_,con);
            SqlDataReader dr = cmd.ExecuteReader();
            return dr;
        }


        public object ShowDataInGridView(string Query_)
        {
            SqlDataAdapter dr = new SqlDataAdapter(Query_, ConnectionString);
            DataSet ds = new DataSet();
            dr.Fill(ds);
            object dataum = ds.Tables[0];
            return dataum;
        }
    }
}