an even easier way, just use/do the following.

1.
read in the xml files with
DataSet.ReadXml method

2.
compare the id columns in the dataset to each other, looking for duplicates or whatever else. I think this can be done very easy with a dataview, ive only done a small amout of work with a dataview so im not to sure.

3.
modify the dataset to contain all the new info

4.
delete old xml file

5.
write the new xml file with using the dataset
DataSet.WriteXml method

hopeing you understand this!
dataset contains an array of tables
the tables contain an array of row which are your records
and the table contains an array of columns

you can call the rows by number then get the value of the rows column by useing the colums name or order number
ex.
gets the data from the first table in the first row of the "Id" column
myDataSet.Table[0].Rows[1]["Id"]

there is quite a lot to datasets and i believe it is one of the most imporant things to know because it will be uses in most if not all your projects which involve databases.

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		private void PlazmosUberXML11111(){
			DataSet serverXML = new DataSet("serverXML");	//server data
			DataSet pcXML = new DataSet("pcXML");			//pc data
			DataSet outputXML = new DataSet("Output");		//output
 
			//read in our files
			try
			{
				serverXML.ReadXml("XMLFile.xml", XmlReadMode.Auto);
				pcXML.ReadXml("XMLFile2.xml", XmlReadMode.Auto);
			}
			catch(Exception ex)
			{
				MessageBox.Show(ex.Message);
			}
 
			//output is server plus new records from pc i think???????
			//so start with server then add the new pc records
			outputXML = serverXML;
 
 
			//compare each record of the pcs xml to the servers, and see if the server is missing any
			//we only need to look at the first table of the dataset because that is where the xml gets read into
			foreach(DataRow pcRow in pcXML.Tables[0].Rows)
			{
				bool hasRow = false;
				foreach(DataRow serverRow in serverXML.Tables[0].Rows)
				{
					//this looks at only the column named "Id" in our records
					//if we find a matching set bool and break out of loop
					if(pcRow["Id"].ToString() == serverRow["Id"].ToString())
					{
						hasRow = true;
						break;
					}
 
				}
 
				if(hasRow)
				{
					//do something if your finding simliar rows
				}
				else //do something if your finding a row it doesnt have
				{
					DataRow newRow = outputXML.Tables[0].NewRow();	//make a new row with the tables scheme
					newRow.ItemArray = pcRow.ItemArray;				//copy over the contents of the row
					outputXML.Tables[0].Rows.Add(newRow);			 //add the new row to our final table
				}
			}
 
			//write it to the xml file
			outputXML.WriteXml("newXML.xml");
 
		}

private void PlazmosUberXML11111(){ DataSet serverXML = new DataSet("serverXML"); //server data DataSet pcXML = new DataSet("pcXML"); //pc data DataSet outputXML = new DataSet("Output"); //output //read in our files try { serverXML.ReadXml("XMLFile.xml", XmlReadMode.Auto); pcXML.ReadXml("XMLFile2.xml", XmlReadMode.Auto); } catch(Exception ex) { MessageBox.Show(ex.Message); } //output is server plus new records from pc i think??????? //so start with server then add the new pc records outputXML = serverXML; //compare each record of the pcs xml to the servers, and see if the server is missing any //we only need to look at the first table of the dataset because that is where the xml gets read into foreach(DataRow pcRow in pcXML.Tables[0].Rows) { bool hasRow = false; foreach(DataRow serverRow in serverXML.Tables[0].Rows) { //this looks at only the column named "Id" in our records //if we find a matching set bool and break out of loop if(pcRow["Id"].ToString() == serverRow["Id"].ToString()) { hasRow = true; break; } } if(hasRow) { //do something if your finding simliar rows } else //do something if your finding a row it doesnt have { DataRow newRow = outputXML.Tables[0].NewRow(); //make a new row with the tables scheme newRow.ItemArray = pcRow.ItemArray; //copy over the contents of the row outputXML.Tables[0].Rows.Add(newRow); //add the new row to our final table } } //write it to the xml file outputXML.WriteXml("newXML.xml"); }

oh yeah a few things i forgot to mention
the code you posted was not formatted properly.
a few tags were spelled differently then they were closing, like:
<Date> 20060426 </Datum>

<Description> testttt </Beschrijving>

and
when you are debugging a program, the files need to be in under \bin\Debug\ of the project folder, that is actually where it is getting executed. that is if you wanted to only use the file name, otherwise put in the full file path



myDataSet.Table[0].Rows[1]["Id"]
doesnt need to be anywhere i was jsut trying to explain how a dataset works