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var dataSource = XElement.Load(path);
var node = dataSource.Element("ScoreExchange");
if (node != null)
{
var exchangeCount = node.Attribute("exchangeCount");
if (exchangeCount != null)
{
var count = int.Parse(exchangeCount.Value);
count = count < 2000 ? 2000 : count + 2000;
node.SetAttributeValue("exchangeCount",count);
}
}
dataSource.Save(path);