protected void ButtonSearch_Click(object sender, EventArgs e)
{
string department = this.DropDownListDepartments.SelectedValue;
DepartmentSelectedEventArgs args = new DepartmentSelectedEventArgs(department);
DepartmentSelected?.Invoke(this, args);
}
private void OnDepartmentSelected(object sender, DepartmentSelectedEventArgs e)
{
string department = e.Department;
var employees = this.Repository.GetEmployees(department);
this.View.BindEmployees(employees);
}