/// Throw an error if the datareader is closed
    /// </summary>
    private void CheckClosed()
    {
      if (_command == null)
        throw new InvalidOperationException("DataReader has been closed");
    }










    /// <summary>
    /// Enumerator support
    /// </summary>
    /// <returns>Returns a DbEnumerator object.</returns>
    public override Collections.IEnumerator GetEnumerator()
    {
................................................................................
    /// <returns>
    /// This function throws an InvalidTypeCast() exception if the requested type doesn't match the column's definition or affinity.
    /// </returns>
    /// <param name="i">The index of the column to type-check</param>
    /// <param name="typ">The type we want to get out of the column</param>
    private void VerifyType(int i, DbType typ)
    {

      SQLiteType t = GetSQLiteType(i);

      if (t.Type == typ) return;

        // Coercable type, usually a literal of some kind
      switch (_fieldTypeArray[i].Affinity)
      {
................................................................................
    /// <summary>
    /// Retreives the values of multiple columns, up to the size of the supplied array
    /// </summary>
    /// <param name="values">The array to fill with values from the columns in the current resultset</param>
    /// <returns>The number of columns retrieved</returns>
    public override int GetValues(object[] values)
    {
      CheckClosed();
      int nMax = _fieldCount;
      if (values.Length < nMax) nMax = values.Length;

      for (int n = 0; n < nMax; n++)
      {
        values.SetValue(GetValue(n), n);
      }

    /// Throw an error if the datareader is closed
    /// </summary>
    private void CheckClosed()
    {
      if (_command == null)
        throw new InvalidOperationException("DataReader has been closed");
    }

    /// <summary>
    /// Throw an error if a row is not loaded
    /// </summary>
    private void CheckValidRow()
    {
      if (_readingState != 0)
        throw new InvalidOperationException("No current row");
    }

    /// <summary>
    /// Enumerator support
    /// </summary>
    /// <returns>Returns a DbEnumerator object.</returns>
    public override Collections.IEnumerator GetEnumerator()
    {
................................................................................
    /// <returns>
    /// This function throws an InvalidTypeCast() exception if the requested type doesn't match the column's definition or affinity.
    /// </returns>
    /// <param name="i">The index of the column to type-check</param>
    /// <param name="typ">The type we want to get out of the column</param>
    private void VerifyType(int i, DbType typ)
    {
      CheckValidRow();
      SQLiteType t = GetSQLiteType(i);

      if (t.Type == typ) return;

        // Coercable type, usually a literal of some kind
      switch (_fieldTypeArray[i].Affinity)
      {
................................................................................
    /// <summary>
    /// Retreives the values of multiple columns, up to the size of the supplied array
    /// </summary>
    /// <param name="values">The array to fill with values from the columns in the current resultset</param>
    /// <returns>The number of columns retrieved</returns>
    public override int GetValues(object[] values)
    {

      int nMax = _fieldCount;
      if (values.Length < nMax) nMax = values.Length;

      for (int n = 0; n < nMax; n++)
      {
        values.SetValue(GetValue(n), n);
      }