XmlReader.GetAttribute Method (Int32)
When overridden in a derived class, gets the value of the attribute with the specified index.
Assemblies: System.Xml (in System.Xml.dll)
System.Xml.ReaderWriter (in System.Xml.ReaderWriter.dll)
i is out of range. It must be non-negative and less than the size of the attribute collection.
An XmlReader method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message “An asynchronous operation is already in progress.”