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Check XML node is exists:
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tmpDoc.Load(filePath);
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XmlNode rootNode = tmpDoc.SelectSingleNode("Controls");
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XmlNodeList slblNodeList = null;
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if (rootNode.SelectSingleNode("SmartLabels") != null)
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slblNodeList = rootNode.SelectSingleNode("SmartLabels").ChildNodes;
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rootNode.SelectSingleNode("SmartLabels") != null这一句很有用！！！
Reference Website:
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