Brovki/DB.cs

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

namespace _02Trade
{
    class DB
    {               
            SqlConnection sqlconnection = new SqlConnection(@"Data Source=(localdb)\05Str; Initial Catalog=02Trade;Integrated Security=True");
            public void OpenConnection()
            {
                if (sqlconnection.State == System.Data.ConnectionState.Closed)
                {
                    sqlconnection.Open();
                }
            }
            public void CloseConnection()
            {
                if (sqlconnection.State == System.Data.ConnectionState.Open)
                {
                    sqlconnection.Close();
                }
            }
            public SqlConnection GetConnection()
            {
                return sqlconnection;
            }
    }
}