How to insert multiple row at a same time in xaml.cs?

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C#

XAML

I insert data using combo boxes. but the problem is i can only insert data in monday .it is not moving forward it is insert data into monday's loop again and again.

private void Button_Click_1(object sender, RoutedEventArgs e)
        {

            try {
          
                //var cmb1 = cmbMon2.SelectedItem as ComboBoxItem;
                //monday.Add(cmb1.Content.ToString());

                //var cmb2 = cmbMon3.SelectedItem as ComboBoxItem;
                //monday.Add(cmb2.Content.ToString());

                //var cmb3 = cmbMon4.SelectedItem as ComboBoxItem;
                //monday.Add(cmb3.Content.ToString());

                //var cmb4 = cmbMon5.SelectedItem as ComboBoxItem;
                //monday.Add(cmb4.Content.ToString());

                //var cmb5 = cmbMon6.SelectedItem as ComboBoxItem;
                //monday.Add(cmb5.Content.ToString());

                var db = new SQLite.SQLiteConnection(App.DBPath);
                tt t1 = new tt();
                tt t2 = new tt();
                tt t3 = new tt();

                for (int i = 0; i < monday.Count; i++)
                {

                    t1.Monday = monday[i].ToString();
                    
                    db.Insert(t1);
                }   

                for(int i=0;i<tuesday.count;i++)>
                {
                    t2.Tuesday = tuesday[i].ToString();
                    db.Update(t2);
                }

                for (int i = 0; i < wednesday.Count;i++ )
                {
                    t3.Wednesday = wednesday[i].ToString();
                    db.Update(t3);
                }

                Frame.Navigate(typeof(MM));
             }
            catch(Exception ex)
            {
               
            }