Proizvod_practik/Дол_Восток/db_helper.cs

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

namespace Дол_Восток
{
    class db_helper
    {
        static public SqlConnection sqlConnection = null;

        static public void openConnection(ref SqlConnection sqlConnection)
        {
            sqlConnection = new SqlConnection("Data Source = ngknn.ru; Initial Catalog = Petunenkova_program; Persist Security Info = True; User ID = 31П; Password = 12357");
            sqlConnection.Open();
        }
    }
}