public void TreeViewData(DataSet ds,string    textColumnName,string parentColumnName,string tagColumnName)

{

 myTreeData root = new myTreeData();
    myTreeData child = null;
    for (i = 0 ; i < ds.Tables[0].Rows.Count; ++i)
    {
     child = new myTreeData(ds.Tables[0].Rows[i][textColumnName].ToString(),ds.Tables[0].Rows[i][tagColumnName],ds.Tables[0].Rows[i][parentColumnName]);
     root.Add(child);
    }

    root.ShowTree(tv);
}



 /// <summary>
 /// 树型节点数据类
 /// </summary>
 public class myTreeData
 {
  public myTreeData()
  {
  }


  public myTreeData(string name)
  {
   Name = name;
  }


  public myTreeData(string name,object tag,object parent)
  {
   Name = name;
   Tag = tag;
   Parent = parent;
  }


  /// <summary>
  /// 子数据集合
  /// </summary>
  private myTreeDataCollection Child = new myTreeDataCollection();


  /// <summary>
  /// 数据对象
  /// </summary>
  public object Tag = null;

  /// <summary>
  /// 名称
  /// </summary>
  public string Name = "";

  /// <summary>
  /// 父亲
  /// </summary>
  public object Parent = null;


  /// <summary>
  /// 添加子数据
  /// </summary>
  /// <param name="child">子数据</param>
  public void Add(myTreeData child)
  {
   int i;
   for (i =  this.Child.Count - 1; i >= 0;--i)
   {
    if (Convert.ToInt32(this.Child[i].Parent) == Convert.ToInt32(child.Tag) )
    {
     child.Child.Add(this.Child[i]);
     this.Child.RemoveAt(i);
    }
   }
   myTreeData parent = FindParent(this,child);
   if (parent == null)
   {
    this.Child.Add(child);
   }
   else
   {
    parent.Child.Add(child);
   }
  }


  /// <summary>
  /// 查找父亲数据
  /// </summary>
  /// <param name="child">子数据</param>
  /// <returns>父亲数据或者null</returns>
  public myTreeData FindParent(myTreeData parent,myTreeData child)
  {
   int i;
   for (i = 0; i < parent.Child.Count; ++i)
   {
    if (Convert.ToInt32(parent.Child[i].Tag) == Convert.ToInt32(child.Parent))
    {
     return parent.Child[i];
    }
    myTreeData temp = FindParent(parent.Child[i],child);
    if (temp != null)
    {
     return temp;
    }
   }
   return null;
  }


  /// <summary>
  //