ADO Net Database ASP.Net Tutorial

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  4. Run a query against a SQL Server database with an XML typed column It then displays results in a tree-view
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"  Inherits="Default"%>



    XML from SQL 2005


    
        
                            OnClick="GetDataButton_Click" />
                
            
            
        
    



File: Default.aspx.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
public partial class Default : System.Web.UI.Page
{
  private TreeNode Root;
  protected void GetDataButton_Click(object sender, EventArgs e)
  {
    string connString = "SERVER=(local)\\SQLEXPRESS;ATTACHDBFILENAME=|DataDirectory|mydata.mdf;INTEGRATED SECURITY=sspi"; //;USER INSTANCE=true;";
    using (SqlConnection conn = new SqlConnection(connString))
    {
      Root = new TreeNode("Families");
      TreeView1.Nodes.Add(Root);
      string cmdText = "SELECT * FROM SampleData";
      SqlCommand cmd = new SqlCommand(cmdText, conn);
      cmd.Connection.Open();
      SqlDataReader reader = cmd.ExecuteReader();
      while (reader.Read())
      {
        SqlXml xml = reader.GetSqlXml(1);
        ProcessData(xml);
      }
      reader.Close();
      cmd.Connection.Close();
    }
  }
  private void ProcessData(SqlXml xml)
  {
    XmlReader reader = xml.CreateReader();
    TreeNode familyNode=null, parentsNode=null, childrenNode=null;
    while (reader.Read())
    {
      if (reader.Depth == 1 && reader.NodeType == XmlNodeType.Element)
      {
        familyNode = new TreeNode(reader.ReadElementContentAsString());
        Root.ChildNodes.Add(familyNode);
        parentsNode = new TreeNode("Parents");
        childrenNode = new TreeNode("Children");
        familyNode.ChildNodes.Add(parentsNode);
        familyNode.ChildNodes.Add(childrenNode);
      }
      if (reader.Depth == 2 && reader.NodeType == XmlNodeType.Element)
      {
        string name = reader["name"];
        string role = reader["Role"];
        TreeNode member = new TreeNode(name);
        if (role.ToLowerInvariant().Equals("father") || role.ToLowerInvariant().Equals("mother"))
          parentsNode.ChildNodes.Add(member);
        else
          if (role.ToLowerInvariant().Equals("child"))
            childrenNode.ChildNodes.Add(member);
      }
    }
  }
}