private void btnAddCategory_Click(object sender, EventArgs e)
{
if (verifyStringToBeAdded(cbbCategory.Text, cbbCategory.Items.Cast<String>()))
{
DaoVideo daoVideo = new DaoVideo();
daoVideo.openConnection(this.GetType(), "sqlErrorHandler");
daoVideo.insertCategory(cbbCategory.Text, this.GetType(), "sqlErrorHandler");
daoVideo.closeConnection();
loadCategories();
updateLbCategory();
}
cbbCategory.Focus();
}