private void Btn_AddCategorySave_Click(object sender, RoutedEventArgs e)
{
if (string.IsNullOrEmpty(TxtBx_CategorTitle.Text))
{
MessageBox.Show("Please enter a category name before clicking the Save button.");
}
else
{
CategoryModel category = new CategoryModel(TxtBx_CategorTitle.Text);
category.AddToDb();
Close();
}
}