private void LoadCategory()
        {
            BSCategory bs = new BSCategory();
            List<Category> datalist = new List<Category>();

            Category cat = new Category();
            cat.CategoryId = 0;
            cat.CategoryName = "Select category";
            datalist.Add(cat);

            foreach (Category c in bs.GetCategoryList(0))
            {
                datalist.Add(c);
            }

            cmbCategory.DisplayMember = "CategoryName";
            cmbCategory.ValueMember = "CategoryId";
            cmbCategory.DataSource = datalist;

            cmbCategory.SelectedIndex = 0;
        }
        private void LoadCategory()
        {
            BSCategory bscat = new BSCategory();
            List<Category> catList = new List<Category>();

            //catList = bscat.GetCategoryList();

            catList = bscat.GetCategoryList(0);

            cmbCategory.DisplayMember = "CategoryName";
            cmbCategory.ValueMember = "CategoryId";
            cmbCategory.DataSource = catList;
        }