This exception indicates that a user attempted to use a method when the object was not in an appropriate state. For example, this exception is thrown if you attempt to write data with a System.Xml.XmlTextWriter that is already closed.

public class InvalidOperationException : SystemException {
// Public Constructors
   public InvalidOperationException( );
   public InvalidOperationException(string message);
   public InvalidOperationException(string message, Exception innerException);
// Protected Constructors
   protected InvalidOperationException(System.Runtime.Serialization.SerializationInfo info,
        System.Runtime.Serialization.StreamingContext context);
}

Hierarchy

Object Exception(System.Runtime.Serialization.ISerializable) SystemException InvalidOperationException

Subclasses

ObjectDisposedException, System.Net.{ProtocolViolationException, WebException}