protected void btnDeleteCategory_Click(object sender, EventArgs e) { if (string.IsNullOrEmpty(hdnCategoryID.Value) == false) { int categoryID = int.Parse(hdnCategoryID.Value); AdminCategories.DeleteCategory(categoryID); BindData(); CategoryEdit.Visible = false; lblMessage.Text = "Category was successfully deleted. "; } else { lblMessage.Text = "Node is not selected."; } }