private void AddCategoryButton_Click(object sender, EventArgs e)
        {
            CategoryUi categoryUi = new CategoryUi();

            categoryUi.Show();
            isAddCategoryButtonClicked = true;
        }
        private void categoryLabel_Click(object sender, EventArgs e)
        {
            CategoryUi categoryUi = new CategoryUi();

            categoryUi.Show();
        }