Models/Functions.cs

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

namespace EHotelMS.Models
{
    public class Functions
    {
        private SqlConnection Con;
        private SqlCommand Cmd;
        private DataTable dt;
        private SqlDataAdapter sda;
        private string ConStr;

        public int setData(string Query)
        {
            int Cnt;
            if (Con.State == ConnectionState.Closed)
            {
                Con.Open();
            }
            Cmd.CommandText = Query;
            Cnt = Cmd.ExecuteNonQuery();
            Con.Close();
            return Cnt;
        }

        public DataTable GetData(string Query)
        {
            dt = new DataTable();
            sda = new SqlDataAdapter(Query, ConStr);
            sda.Fill(dt);
            return dt;
        }

        public Functions()
        {
            ConStr = @"Data Source=.;User Id=sa;Initial Catalog=EHotelDb;Integrated Security=True;";
            Con = new SqlConnection(ConStr);
            Cmd = new SqlCommand();
            Cmd.Connection = Con;
        }
    }
}