How To exceute following code at specific day and specific time

if ((DateTime.Now.DayOfWeek== DayOfWeek.Saturday) &&(DateTime.Now.Hour==19) &&(DateTime.Now.Minute==15))
            {
                exportsqldatatoexcle();

                emailattachment();
              
                
            }

          
            
        }

        public void exportsqldatatoexcle()
        {
            string con1 = "Data Source=ADMIN\\SQLEXPRESS;Initial Catalog=PhysioCure; Integrated Security=true";
            SqlConnection connection = new SqlConnection(con1);
            connection.Open();
            sda = new SqlDataAdapter("select PationName,RegistrationDate,ContactNo,Age,Sex,Chief_Complain,Investigation_Result,PastHistoryAny,Physical_Examination,Medications,Prognosis,Electro_Therapy,Neuro_Rehabilitation,Ortho_Rehabilitation,Cardio_Pulmonery_Rehabilitation,Sports_Rehabilitation from Physio_cureTable order by RegistrationDate desc", con1);
            dt = new DataTable();
            sda.Fill(dt);

            DataColumnCollection dccollection = dt.Columns;

            Microsoft.Office.Interop.Excel.ApplicationClass excelapp = new Microsoft.Office.Interop.Excel.ApplicationClass();

            excelapp.Application.Workbooks.Add(Type.Missing);


            for (int i = 1; i < dt.Rows.Count + 1; i++)
            {

                for (int j = 1; j < dt.Columns.Count + 1; j++)
                {
                    if (i == 1)
                    {
                        excelapp.Cells[i, j] = dccollection[j - 1].ToString();

                    }
                    else
                    {
                        excelapp.Cells[i, j] = dt.Rows[i - 1][j - 1].ToString();

                    }

                }

            }

            excelapp.ActiveWorkbook.SaveCopyAs("E:\\Winform n console\\PhysioCure\\PhysioCure\\PhysioCure\\Patient_Details.xls");
            excelapp.ActiveWorkbook.Saved = true;
            excelapp.Quit();
            MessageBox.Show("Detail file successfully create!");

        }

        private void emailattachment()
        {
            //try
            //{
                MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
                mail.From = new MailAddress("My email id");
                mail.To.Add("My frnd email id");
                mail.Subject = "Sending you Patient_Details File - 1";
                mail.Body = "Please Check Mail With Attachment";

                System.Net.Mail.Attachment attachment;
                attachment = new Attachment("E:\\Winform n console\\PhysioCure\\PhysioCure\\PhysioCure\\Patient_Details.xls");
                mail.Attachments.Add(attachment);

                SmtpServer.Port = 587;
                SmtpServer.Credentials = new System.Net.NetworkCredential("My email id", "Password");
                SmtpServer.EnableSsl = true;

                SmtpServer.Send(mail);

                MessageBox.Show("Details File send on your mail please check your mail");