DataReaderEnumerable.cs

public class DataReaderEnumerable : IEnumerable<IDataReader>, IDisposable  
{
    public IDataReader DataReader { get; private set; }
    private bool enumerated = false;

    public DataReaderEnumerable(IDataReader dataReader)
    {
        this.DataReader = dataReader;
    }

    #region IEnumerable<IDataReader> Members

    public IEnumerator<IDataReader> GetEnumerator()
    {
        if (enumerated)
            throw new InvalidOperationException("The IDataReader can only be enumerated once.");

        enumerated = true;
        return new DataReaderEnumerator(this.DataReader);
    }

    #endregion

    #region IEnumerable Members

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
        return this.GetEnumerator();
    }

    #endregion

    #region IDisposable Members

    public void Dispose()
    {
        this.DataReader.Dispose();
    }

    #endregion
}

public class DataReaderEnumerator : IEnumerator<IDataReader>  
{
    public IDataReader DataReader { get; private set; }

    public DataReaderEnumerator(IDataReader dataReader)
    {
        this.DataReader = dataReader;
    }

    #region IEnumerator<IDataReader> Members

    public IDataReader Current
    {
        get { return this.DataReader; }
    }

    #endregion

    #region IDisposable Members

    public void Dispose()
    {
        this.DataReader.Dispose();
    }

    #endregion

    #region IEnumerator Members

    object System.Collections.IEnumerator.Current
    {
        get { return this.Current; }
    }

    public bool MoveNext()
    {
        return this.DataReader.Read();
    }

    public void Reset()
    {
        throw new NotImplementedException();
    }

    #endregion
}