Use the SelChange event to notify your application that the selected text was changed. The SelChange event is called even if the selection is empty and user moves the cursor. The SelChange event is called anytime when the position of the cursor was changed.  Use the SelText property to get the selected text. The SelStart and SelLenght properties determine the position of the selected text. Use the SelForeColor and SelBackColor properties to specify the colors for the selected text.

private void SelChange(object sender)
{
}

Private Sub SelChange(ByVal sender As System.Object) Handles SelChange
End Sub

private void SelChange(object sender, EventArgs e)
{
}

void OnSelChange()
{
}

void __fastcall SelChange(TObject *Sender)
{
}

procedure SelChange(ASender: TObject; );
begin
end;

procedure SelChange(sender: System.Object; e: System.EventArgs);
begin
end;

begin event SelChange()
end event SelChange

Private Sub SelChange(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SelChange
End Sub

Private Sub SelChange()
End Sub

Private Sub SelChange()
End Sub

LPARAMETERS nop

PROCEDURE OnSelChange(oExpression)
RETURN

<SCRIPT EVENT="SelChange()" LANGUAGE="JScript">
</SCRIPT>

<SCRIPT LANGUAGE="VBScript">
Function SelChange()
End Function
</SCRIPT>

Procedure OnComSelChange 
	Forward Send OnComSelChange 
End_Procedure

METHOD OCX_SelChange() CLASS MainDialog
RETURN NIL

void onEvent_SelChange()
{
}

function SelChange as v ()
end function

function nativeObject_SelChange()
return

The following VB sample displays the selected text when the user changes it:

Private Sub Expression1_SelChange()
    If Not Expression1.SelText = "" Then
        Debug.Print Expression1.SelText
    End If
End Sub

The following C++ sample displays the selected text when the user changes it:

void OnSelChangeExpression1() 
{
	OutputDebugString( m_edit.GetSelText() );
}

The following VB.NET sample displays the selected text when the user changes it:

Private Sub AxExpression1_SelChange(ByVal sender As Object, ByVal e As System.EventArgs) Handles AxExpression1.SelChange
    With AxExpression1
        Debug.WriteLine(.SelText)
    End With
End Sub

The following C# sample displays the selected text when the user changes it:

private void axExpression1_SelChange(object sender, EventArgs e)
{
	System.Diagnostics.Debug.WriteLine(axExpression1.SelText);
}

The following VFP sample displays the selected text when the user changes it:

*** ActiveX Control Event ***

with thisform.Expression1
	wait window nowait .SelText
endwith