//--------------menage children----------------//
/// <summary>
/// adds a child to the data base
/// Exception:
/// there is are the same Id in the data base.
/// </summary>
/// <param name="child">child object to add </param>
public void addChild(Child child)
{
if (DataSourceXml.ChildRoot.Elements().Any(x => (Convert.ToInt32(x.Element("Id").Value)) == child.Id))
{
throw new DALException("There is the same child id alredy");
}
DataSourceXml.ChildRoot.Add(child.Clone().ChildToXML());
DataSourceXml.saveChildren();
}
/// <summary>
/// delete a Child from the data base
/// </summary>
/// <param name="id">childs id to remove</param>
public void removeChild(int id)
{
XElement result = (from child in DataSourceXml.ChildRoot.Elements()
where Convert.ToInt32(child.Element("Id").Value) == id
select child).FirstOrDefault();
if (result != null)
{
result.Remove();
DataSourceXml.saveChildren();
}
else
{
throw new DALException("ERROR: There is no Child with this id to remove");
}
}