private void SearchButton_Click(object sender, RoutedEventArgs e)
{
var text = KeywordTextBox.Text;
var keywords = text.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
var list = new List <string>();
for (var i = 0; i < keywords.Length; i++)
{
list.Add(keywords[i].Replace(" ", string.Empty));
}
var exercises = ExerciseManager.Filter(list);
ExerciseListBox.ItemsSource = exercises;
}