private void btnGetAll_Click(object sender, EventArgs e)
 {
     if (Application.OpenForms[GlobalConstants.GetAllForm] != null)
     {
         _form = Application.OpenForms["getAllForm"];
         _form.Focus();
     }
     else
     {
         if (_todoService.Count() > 0)
         {
             if (Application.OpenForms[GlobalConstants.NewTodoForm] != null)
             {
                 Application.OpenForms[GlobalConstants.NewTodoForm].Close();
             }
             getAllForm form = new getAllForm
             {
                 MdiParent     = this,
                 StartPosition = FormStartPosition.CenterScreen
             };
             form.Show();
         }
         else
         {
             MessageBox.Show(GlobalConstants.EmptyList, GlobalConstants.CaptionInfo, MessageBoxButtons.OK, MessageBoxIcon.Information);
             DialogResult result = MessageBox.Show(GlobalConstants.AddTodoQuestion, GlobalConstants.CaptionQuestion, MessageBoxButtons.YesNo, MessageBoxIcon.Information);
             if (result == DialogResult.Yes)
             {
                 if (Application.OpenForms[GlobalConstants.NewTodoForm] == null)
                 {
                     NewTodoForm newTodoForm = new NewTodoForm
                     {
                         MdiParent     = this,
                         StartPosition = FormStartPosition.CenterScreen
                     };
                     newTodoForm.Show();
                 }
                 else
                 {
                     Form form = Application.OpenForms[GlobalConstants.NewTodoForm];
                     form.Focus();
                 }
             }
         }
     }
 }
        private void btnNew_Click(object sender, EventArgs e)
        {
            if (Application.OpenForms[GlobalConstants.NewTodoForm] != null)
            {
                _form = Application.OpenForms[GlobalConstants.NewTodoForm];
                _form.Focus();
            }
            else
            {
                if (Application.OpenForms[GlobalConstants.GetAllForm] != null)
                {
                    Application.OpenForms[GlobalConstants.GetAllForm].Close();
                }

                NewTodoForm form = new NewTodoForm
                {
                    MdiParent     = this,
                    StartPosition = FormStartPosition.CenterScreen
                };
                form.Show();
            }
        }