//Search the Library for the Books by Author Name
//and display the results in the DataGrid
private void AuthorSearch(object sender, TextChangedEventArgs e)
{
//If we are in Regular Search Mode
if (!IsMultiSearch)
{
//Search for the books by Author Name
//and display the results in the DataGrid
dataLib.ItemsSource =
mainLibrary.FindBook(b => b.Author.ToLower().Contains(txtAuthor.Text.ToLower()));
}
//If User inputs white spaces in the Search by Author TextBox -
//Show all the Items in the Library
if (string.IsNullOrWhiteSpace(txtAuthor.Text))
{
RefreshDataGrid();
}
}