1. Standard fields are fields used for describing a node.
   Standard fields can be used by passing StandardFields enum:
   • StandardFields.ID
   • StandardFields.ParentID
   • StandardFields.HTMLValue
   • StandardFields.Icon
   • StandardFields.Level
   • StandardFields.Expanded
   • StandardFields.NodePosition
   
   Example:
   

   oTreeDB.Fields[TreeDB.StandardFields.ID].Value = id;
   oTreeDB.Fields[TreeDB.StandardFields.HTMLValue].Value = text;
   

2. Additional fields are fields containing additional data attached into a node.
   Those additional fields can be added to Fields collection by calling Add() method:
   • Add(string FieldName, string FieldType)
   • Add(string FieldName, string Type, string Data)
   
   Example:
   

   // add additional field
   oTreeDB.Fields.Add("Name", "text");
   oTreeDB.Fields.Add("Age", "numeric", "26");
   
   // change value of additional field
   oTreeDB.Fields["Name"].Value = "Peter";
   oTreeDB.Fields["Age"].Value = "21";
   

// default fields
oTreeDB.Fields[TreeDB.StandardFields.Icon].Value = "folder.gif";
oTreeDB.Fields[TreeDB.StandardFields.Expanded].Value = "0";

// additional fields
oTreeDB.Fields["Address"].Value = address;

// SetProperties method
oTreeDB.Fields["Age"].SetProperties("col_Age", "numeric");

// Add method
oTreeDB.Fields.Add("Address", "text");
oTreeDB.Fields.Add("Age", "numeric", "26");