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{
if (!Page.IsPostBack)
{
TreeNode nodeCategory ;
connection conn = new connection();
List<Category> category = conn.getCategory();
Stack<Category> storeCategory = new Stack<Category>();
storeCategory.Push(category[0]);
nodeCategory = new TreeNode(category[0].Name.Trim(), category[0].Id.Trim());
TreeView1.Nodes.Add(nodeCategory);
getTreeView(storeCategory, category, nodeCategory);
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{
bool check = false;
try
{
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