QuotationMaker/Modals/DbConn.cs

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

public class DbConn
{
    protected string _connectionString { get; set; }
    protected SqlConnection _sqlConnection { get; set; }

    public DbConn()
    {
        this._connectionString = GlobalClass.appsettings("ConnectionStrings:SQLConnectionString");
    }

    public SqlConnection sqlConnection()
    {
        this._sqlConnection = new SqlConnection(this._connectionString);
        if (this._sqlConnection.State != ConnectionState.Open)
        {
            this._sqlConnection.Open();
        }
        return this._sqlConnection;
    }

    public void closeConn()
    {
        if (this._sqlConnection.State != ConnectionState.Closed)
        {
            this._sqlConnection.Close();
            this._sqlConnection.Dispose();
        }
    }
}