Update Existing Xml and If Xml is not created it will create and then update the Existing Xml...

static public void MoveUserInfo(string destFolder)
{
string _sourcePath = "";
string _configurationPath = "";
_sourcePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory.ToString(), "UserInfo.xml");
_configurationPath = Path.Combine(Path.Combine(destFolder, "Configuration"), "UserInfo.xml");

if (!Directory.Exists(Path.Combine(destFolder, "Configuration")))
Directory.CreateDirectory(Path.Combine(destFolder, "Configuration"));
if (File.Exists(_configurationPath) == true)
{
updateUserInfoXML(_sourcePath, _configurationPath);
}
else //Create UserInfo.Xml file into Directory if not Exist in the Destination Path..
{
File.Copy(_sourcePath, _configurationPath, true);
}
}

static public void updateUserInfoXML(string pathSource, string pathDestination)
{
try
{
XmlDocument docSource = new XmlDocument();
XmlDocument docDestination = new XmlDocument();
string xmlMmessage = "";
docSource.Load(pathSource);
docDestination.Load(pathDestination);
XmlNodeList elemList = docSource.GetElementsByTagName("Asset");
//XmlNodeList elemListRoll = docSource.GetElementsByTagName("role");
//XmlNodeList elemListUser = docSource.GetElementsByTagName("User");
string attrAssetID;
XmlNodeList eleDestNodeList;
XmlNode eleDestinationNode = docDestination.DocumentElement;

foreach (XmlNode eleSourceNode in elemList)
{
attrAssetID = eleSourceNode.Attributes["assetid"].Value;
// attrRollID = eleSourceNode.Attributes["rollid"].Value;
//attrUserID = eleSourceNode.Attributes["Userid"].Value;

eleDestNodeList = docDestination.SelectNodes("/UserInfo/Asset[@assetid='" + attrAssetID.ToString() + "']");

if (eleDestNodeList.Count > 0)
{
eleDestinationNode = docDestination.SelectSingleNode("/UserInfo/Asset[@assetid='" + attrAssetID.ToString() + "']");
//docSource.AppendChild()
//---IF NODE EXISTS THEN REPLACE THE SOURCE NODE WITH TARGET NODE
XmlDocumentFragment fragment = docDestination.CreateDocumentFragment();
fragment.InnerXml = eleSourceNode.OuterXml;
eleDestinationNode.ParentNode.ReplaceChild(fragment, eleDestinationNode);
xmlMmessage = "Sucessfully replaced";
}
else
{
//---IF NODE IS NOT EXISTS THEN APPEND THE SOURCE NODE WITH TARGET NODE

XmlDocumentFragment fragment = docDestination.CreateDocumentFragment();
fragment.InnerXml = eleSourceNode.OuterXml;
eleDestinationNode.AppendChild(fragment);
xmlMmessage = "Sucessfully Append";
}
}
docDestination.PreserveWhitespace = true;
docDestination.Save(pathDestination);
Console.WriteLine(xmlMmessage);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message.ToString());
Console.ReadLine();
}
}

Create Xml File (using dataset)

StringBuilder _UserInfo = new StringBuilder();
dataset infoDS=new DataSet();
DataSet infoDS = PXE.Facade.PXEFacade.GetUserRoleOnAsset(bookId, nAssetId);
_UserInfo.Append("");
_UserInfo.Append("");
_UserInfo.Append("");
for (int i = 0; i < infoDS.Tables[0].Rows.Count; i++) { if (infoDS.Tables[0].Rows.Count > 0)
{

string _RoleId = infoDS.Tables[0].Rows[i]["roleid"].ToString();
string _UserId = infoDS.Tables[0].Rows[i]["userid"].ToString();
string _RoleName = infoDS.Tables[0].Rows[i]["roleName"].ToString();
string _Abbreviation = infoDS.Tables[0].Rows[i]["abbreviation"].ToString();
string _DisplayName = infoDS.Tables[0].Rows[i]["displayName"].ToString();

_UserInfo.Append("");

_UserInfo.Append("");

_UserInfo.Append("");
//_UserInfo.Append("");

if (File.Exists(tempFolder + "\\UserInfo.xml"))
{
File.SetAttributes(tempFolder + "\\UserInfo.xml", FileAttributes.Normal);

}

StreamWriter _sw1 = new StreamWriter(tempFolder + "\\UserInfo.xml");
_sw1.WriteLine(_UserInfo.ToString());
_sw1.Flush();
_sw1.Close();
_sw1.Dispose();


}
}
StreamWriter _sw = new StreamWriter(tempFolder + "\\UserInfo.xml");
_UserInfo.Append("");
_UserInfo.Append("");
_sw.WriteLine(_UserInfo.ToString());
_sw.Flush();
_sw.Close();
_sw.Dispose();

/**/