public List<TaskToDistrict> ShowViewToSelectManyDialog()
 {
     var selectionForm = new SelectTaskToDistrictListForm(this);
     selectionForm.ShowDialog();
     return selectionForm.Selected;
 }
 public TaskToDistrict ShowViewToSelectOneDialog()
 {
     var selectionForm = new SelectTaskToDistrictListForm(this);
     selectionForm.ShowDialog();
     return selectionForm.Selected[0];
 }