Converter for Microsoft Project 2002 XML file to TODOLIST XML file

using System;
using System.Data;
using System.IO;
using System.Xml;
using System.Xml.XPath;
using System.Globalization;
using System.Text.RegularExpressions;
namespace TODOListConverter
{
	public class XmlTransformer{
		private string xmlRoot, xmlTask;
		private XmlDocument doc,newdoc;
		private XmlDocumentFragment docfrag;

		public XmlTransformer(){
			xmlRoot = @"<!DOCTYPE TODOLIST [<!ELEMENT TODOLIST ANY><!ELEMENT TASK ANY><!ATTLIST TASK OUTLINENUMBER ID #REQUIRED >]><TODOLIST PROJECTNAME=""{0}"" />";
			xmlTask = @"<TASK 
							TITLE=""{0}"" 
							OUTLINENUMBER=""{1}"" 
							OUTLINELEVEL=""{2}"" 
							ID=""{3}"" 
							PERSON=""{4}"" 
							PERCENTDONE=""{5}"" 
							COMMENTS=""{6}"" 
							STARTDATESTRING=""{7}"" 
							STARTDATE=""{8}"" 
							DUEDATESTRING=""{9}"" 
							EARLIESTDUEDATE=""{10}"" 
							DUEDATE=""{10}""
							PRIORITY=""{11}""  
							FILEREFPATH = ""{12}"" />";

			doc = new XmlDocument();
			newdoc = new XmlDocument();
		}

		private string saferow(DataRow row,string index){
			try{
				return row[index].ToString();
			}catch{
				return string.Empty;
			}
		}

		private string FormatDate(string datetxt,out string days){
			DateTime original = new DateTime(1899,12,31,0,0,0,0);
			DateTime current = Convert.ToDateTime(datetxt,new DateTimeFormatInfo());
			TimeSpan result = current.Subtract(original);
			days = (result.Days + 1).ToString("#.00000000");
			return current.ToString("MM/dd/yyyy");
		}

		private string GetPriority(string priority){
			char[] prior = priority.ToCharArray();
			if(prior.Length > 0){
				return prior[0].ToString();
			}else{
				return "5";
			}
		}

		private void ConcatData(DataRow row){
			try{
				string days = "0.00000000";
				int level = Convert.ToInt32(saferow(row,"OutlineLevel"));
				string comments = GetPredecessors(saferow(row,"UID")) + saferow(row,"Notes");
				comments = Regex.Replace(comments,"(s*)\\r\\n(s*)","{0}");
				docfrag = newdoc.CreateDocumentFragment();
				docfrag.InnerXml = string.Format(xmlTask,
					saferow(row,"Name").Replace("&","&amp;"),
					saferow(row,"OutlineNumber"),
					saferow(row,"OutlineLevel"),
					(Convert.ToInt32(saferow(row,"ID"))+1),
					GetResourceName(saferow(row,"UID")),
					saferow(row,"PercentWorkComplete"),
					comments,
					FormatDate(saferow(row,"Start"),out days),
					days,
					FormatDate(saferow(row,"Finish"),out days),
					days,
					GetPriority(saferow(row,"Priority")),
					saferow(row,"HyperlinkAddress")
					);
				if(level == 0){
					newdoc.DocumentElement.AppendChild(docfrag);
				}else if(level == 1){
					newdoc.DocumentElement.FirstChild.AppendChild(docfrag);
				}else{
					string[] outlineno = saferow(row,"OutlineNumber").Split('.');
					string temp = string.Join(".",outlineno,0,outlineno.Length-1);
					newdoc.GetElementById(temp).AppendChild(docfrag);
				}
			}catch(Exception e){
				Console.WriteLine(e.Message); 
			}catch{
				Console.WriteLine("Error Occurred"); 
			}
		}

		private string GetPredecessors(string TaskUID){
			string PredecessorsID = string.Empty;
			XmlNodeList tasknode;
			XmlNode resnode = null;
			try{
				tasknode = doc.SelectNodes("/Project/Tasks/Task/UID");
				foreach(XmlNode node in tasknode){
					if(node.InnerText == TaskUID){
						resnode = node.SelectSingleNode("parent::Task/PredecessorLink/PredecessorUID");
						break;
					}
				}
				if(resnode != null){
					foreach(XmlNode node in tasknode){
						if(node.InnerText == resnode.InnerText){
							PredecessorsID = node.ParentNode.ChildNodes[1].InnerText;
							break;
						}
					}	 
					if(PredecessorsID != null && PredecessorsID.Length > 0){
						int tempid = (Convert.ToInt32(PredecessorsID) + 1);
						PredecessorsID = string.Format("Predecessor Node : tdl://{0} {1}",tempid,"{0}") ;
					}else{
						PredecessorsID = string.Empty;
					}
				}
			}catch(Exception e){
				Console.WriteLine(e.Message);				 
			}catch{
				Console.WriteLine("Error Occurred");				 
			}
			return PredecessorsID;
		}

		private string GetResourceName(string TaskUID){
			string ResName = string.Empty;
			XmlNodeList tasknode,residnode;
			XmlNode resnode = null;
			XmlNode resourcenode = null;
			try{
				tasknode = doc.SelectNodes("/Project/Assignments/Assignment/TaskUID");
				foreach(XmlNode node in tasknode){
					if(node.InnerText == TaskUID){
						resnode = node.SelectSingleNode("parent::Assignment/ResourceUID");
						break;
					}
				}
				if(resnode != null){
					residnode = doc.SelectNodes("/Project/Resources/Resource/UID");
					foreach(XmlNode node in residnode){
						if(node.InnerText == resnode.InnerText){
							resourcenode = node.SelectSingleNode("parent::Resource");
							break;
						}
					}	 
					if(resourcenode != null){
						ResName = resourcenode.SelectSingleNode("Name").InnerText; 
					}else{
						ResName = string.Empty;
					}
				}
			}catch(Exception e){
				Console.WriteLine(e.Message);				 
			}catch{
				Console.WriteLine("Error Occurred");				 
			}
			return ResName;
		}

		public string Transform(string xmlstring){
			string xmlstr = string.Empty;
			try{
				doc.LoadXml(xmlstring);
				try
				{
					xmlstring = doc.SelectSingleNode("/Project/Title").InnerText;
				}
				catch
				{
					xmlstring = doc.SelectSingleNode("/Project/Name").InnerText;
				}
				newdoc.LoadXml(string.Format(xmlRoot,xmlstring));
				DataSet ds = new DataSet();
				ds.ReadXml(new StringReader(doc.SelectNodes("/Project/Tasks").Item(0).OuterXml));
				foreach(DataRow row in ds.Tables[0].Rows){
					ConcatData(row);
				}
				xmlstr = newdoc.InnerXml;
			#if DEBUG
				Console.WriteLine(newdoc.InnerXml);
			#endif
			}catch(Exception e){
				Console.WriteLine("Error : File not in a proper format");
			}catch{
				Console.WriteLine("Error Occurred");
			}
			return xmlstr;
		}
	}
}