private void LoadTreeDangers() { OperationResult objOperationResult = new OperationResult(); ProtocolBL objProtocolBL = new ProtocolBL(); List <SystemUserList> objSystemUserList = new List <SystemUserList>(); treeViewUserExternal.Nodes.Clear(); TreeNode nodePrimary = null; objSystemUserList = objProtocolBL.GetAllSystemUserExternal(); foreach (var item in objSystemUserList) { #region Add Main Nodes //case "-1": // 1. Add Main nodes: nodePrimary = new TreeNode(); nodePrimary.Text = item.v_UserName; nodePrimary.Name = item.i_SystemUserId.ToString(); treeViewUserExternal.Nodes.Add(nodePrimary); //break; #endregion } treeViewUserExternal.ExpandAll(); }