private void AlterBooksForm_Load(object sender, EventArgs e)
{
lblEmployeeName.Text = "Welcome " + employee.FullName;
List <string> book = DBConnection.cmboBook();
listDisplay.HorizontalScrollbar = true;
cmboBook.Items.AddRange(book.ToArray());
cmboCategory.Items.AddRange(DBConnection.getCategorie().ToArray());
cmboCategory.SelectedIndex = 0;
book = null;
}
private void tabControl1_Click(object sender, EventArgs e)
{
cmboCategory.Items.AddRange(DBConnection.getCategorie().ToArray());
cmboCategory.SelectedIndex = 0;
}