' This method is called by the ExtractRowValues methods of
' GridView and DetailsView. Retrieve the current value of the 
' cell from the Checked state of the Radio button.
Public Overrides Sub ExtractValuesFromCell( _
    ByVal dictionary As IOrderedDictionary, _
    ByVal cell As DataControlFieldCell, _
    ByVal rowState As DataControlRowState, _
    ByVal includeReadOnly As Boolean)
    ' Determine whether the cell contain a RadioButton 
    ' in its Controls collection.
    If cell.Controls.Count > 0 Then
        Dim radio As RadioButton = CType(cell.Controls(0), RadioButton)

        Dim checkedValue As Object = Nothing
        If radio Is Nothing Then
            ' A RadioButton is expected, but a null is encountered.
            ' Add error handling.
            Throw New InvalidOperationException( _
                "RadioButtonField could not extract control.")
        Else
            checkedValue = radio.Checked
        End If


        ' Add the value of the Checked attribute of the
        ' RadioButton to the dictionary.
        If dictionary.Contains(DataField) Then
            dictionary(DataField) = checkedValue
        Else
            dictionary.Add(DataField, checkedValue)
        End If
    End If
End Sub

// This method is called by the ExtractRowValues methods of 
// GridView and DetailsView. Retrieve the current value of the 
// cell from the Checked state of the Radio button.
public override void ExtractValuesFromCell(IOrderedDictionary dictionary,
                                           DataControlFieldCell cell,
                                           DataControlRowState rowState,
                                           bool includeReadOnly)
{

  // Determine whether the cell contains a RadioButton 
  // in its Controls collection.
  if (cell.Controls.Count > 0) {
    RadioButton radio = cell.Controls[0] as RadioButton;

    object checkedValue = null;
    if (null == radio) {
      // A RadioButton is expected, but a null is encountered.
      // Add error handling.
      throw new InvalidOperationException
          ("RadioButtonField could not extract control.");
    }
    else {
        checkedValue = radio.Checked;
    }


    // Add the value of the Checked attribute of the
    // RadioButton to the dictionary.
    if (dictionary.Contains(DataField))
      dictionary[DataField] = checkedValue;
    else
      dictionary.Add(DataField, checkedValue);
  }
}

// This method is called by the ExtractRowValues methods on GridView 
//and DetailsView. Retrieve
// the current value of the cell from the Checked state of the Radio button.
public void ExtractValuesFromCell(IOrderedDictionary dictionary, 
    DataControlFieldCell cell, DataControlRowState rowState, 
    boolean includeReadOnly) throws InvalidOperationException
{
    // Does the cell contain a RadioButton in its Controls collection?
    if (cell.get_Controls().get_Count() > 0) {
        RadioButton radio = (RadioButton)cell.get_Controls().get_Item(0);

        Object checkedValue = null;
        if (null == radio) {
            // A RadioButton is expected,
            // but a null is encountered. Add error handling.
            throw new InvalidOperationException("RadioButtonField could not"
                + "extract control.");
        }
        else {
            checkedValue = (System.Boolean)radio.get_Checked();
        }
        // Add the value of the Checked attribute of the
        // RadioButton to the dictionary.
        if (dictionary.Contains(get_DataField())) {
            dictionary.set_Item(get_DataField(), checkedValue);
        }
        else {
            dictionary.Add(get_DataField(), checkedValue);
        }
    }
} //ExtractValuesFromCell