Навигация по сайту

protected void TreeLibrary_SelectedNodeChanged(object sender, 
EventArgs e)
    {
        Label1.Text = "Вы выбрали категорию " + 
TreeLibrary.SelectedNode.Text;
    }

TreeView1.ExpandAll();
TreeView1.CollapseAll();

<asp:TreeView ID="TreeViewCatProd" runat="server" 
ImageSet="BulletedList3" 
      OnTreeNodePopulate="TreeViewCatProd_TreeNodePopulate" 
ForeColor="DarkOliveGreen">
      </asp:TreeView>

public partial class Products : System.Web.UI.Page
{
  string connectionString = @"Data Source=.\SQLEXPRESS;Initial 
Catalog=Northwind;Integrated Security=True";

  protected void Page_Load(object sender, EventArgs e)
  {
    if (!Page.IsPostBack)
    {
      BindData();
    }
  }

protected SqlDataReader CreateSqlDataReader(string SelectQuery, 
string ConnectionString)
  {
    SqlConnection  Connection = new 
SqlConnection(ConnectionString);
      SqlCommand Command = new SqlCommand(SelectQuery, Connection);
    try
    {
      Command.CommandType = CommandType.Text;
      Command.Connection.Open();
      SqlDataReader reader = 
Command.ExecuteReader(CommandBehavior.CloseConnection);
      return reader;
    }
    catch
    {
      Connection.Close();
      return null;
    }
  }

protected void BindData()
  {
    TreeNode parentNode = null;
    SqlDataReader reader = CreateSqlDataReader("Select 
CategoryID,CategoryName from Categories", connectionString);
    if (reader!=null)
    {
      while (reader.Read())
      {
        parentNode = new 
TreeNode(reader["CategoryName"].ToString(), 
reader["CategoryID"].ToString());
        parentNode.Collapse();
        parentNode.PopulateOnDemand = true;
        parentNode.SelectAction = TreeNodeSelectAction.Expand;
        TreeViewCatProd.Nodes.Add(parentNode);
      }
      reader.Close();
    }
 }

protected void TreeViewCatProd_TreeNodePopulate(object sender, 
TreeNodeEventArgs e)
  {
    TreeNode node = e.Node;
    if (node.PopulateOnDemand)
    {
      string command = string.Format("Select ProductID, 
ProductName from Products where CategoryID={0}", node.Value);
      SqlDataReader reader = CreateSqlDataReader(command, 
connectionString);
      node.ChildNodes.Clear();
      if (reader != null)
      {
        while (reader.Read())
        {
          TreeNode childNode = new 
TreeNode(reader["ProductName"].ToString());
          childNode.SelectAction = TreeNodeSelectAction.None;
          node.ChildNodes.Add(childNode);
        }
        node.Expand();
        reader.Close();
      }
    }
  }

ShowCheckBoxes="Leaf"

<asp:XmlDataSource ID="XmlDataSource3" runat="server" 
DataFile="~/menu.xml"></asp:XmlDataSource>
<asp:TreeView ID="TreeMenu" runat="server" 
DataSourceID="XmlDataSource3" BackColor="#FFFBD6" 
   Font-Names="Verdana" Font-Size="0.8em" ForeColor="#990000" 
Height="78px"
   Width="415px" ShowCheckBoxes="Parent" 
OnTreeNodeCheckChanged="TreeMenu_TreeNodeCheckChanged" 
NodeWrap="True" PopulateNodesFromClient="False">
   <DataBindings>
      <asp:TreeNodeBinding DataMember="name" 
ValueField="#InnerText" />
      <asp:TreeNodeBinding DataMember="price" FormatString="{0} 
руб." TextField="#InnerText" ValueField="#InnerText" />
      <asp:TreeNodeBinding DataMember="description" 
TextField="#InnerText" />
      <asp:TreeNodeBinding DataMember="calories" 
FormatString="{0} калорий" TextField="#InnerText" />
      <asp:TreeNodeBinding DataMember="food" TextField="name" />
      <asp:TreeNodeBinding DataMember="pizza_menu" Text="Меню 
Пиццы" Value="Меню Пиццы" />
   </DataBindings>
</asp:TreeView>
<asp:Label ID="Label1" runat="server" ></asp:Label>

protected void TreeMenu_TreeNodeCheckChanged(object sender, 
TreeNodeEventArgs e)
    {
        decimal sumPrices=0.0M;
        if (TreeMenu.CheckedNodes.Count > 0)
        {
            Label1.Text = "";
            foreach (TreeNode node in TreeMenu.CheckedNodes)
            {
              sumPrices += decimal.Parse(node.ChildNodes[0].Value);
            }
            Label1.Text = sumPrices.ToString() +"<br>";
        }
    }