Use the DblClick event to notify your application that user double clicked the control. By default, the control selects the word from the cursor when the user double clicks the control's client area. Use the ClientToCursor method to convert client coordinates to cursor coordinates. Use the TextLine property to retrieve the line giving its index. 

private void DblClick(object sender,short Shift,int X,int Y)
{
}

Private Sub DblClick(ByVal sender As System.Object,ByVal Shift As Short,ByVal X As Integer,ByVal Y As Integer) Handles DblClick
End Sub

private void DblClick(object sender, AxEXEDITLib._IEditEvents_DblClickEvent e)
{
}

void OnDblClick(short Shift,long X,long Y)
{
}

void __fastcall DblClick(TObject *Sender,short Shift,int X,int Y)
{
}

procedure DblClick(ASender: TObject; Shift : Smallint;X : Integer;Y : Integer);
begin
end;

procedure DblClick(sender: System.Object; e: AxEXEDITLib._IEditEvents_DblClickEvent);
begin
end;

begin event DblClick(integer Shift,long X,long Y)
end event DblClick

Private Sub DblClick(ByVal sender As System.Object, ByVal e As AxEXEDITLib._IEditEvents_DblClickEvent) Handles DblClick
End Sub

Private Sub DblClick(Shift As Integer,X As Single,Y As Single)
End Sub

Private Sub DblClick(ByVal Shift As Integer,ByVal X As Long,ByVal Y As Long)
End Sub

LPARAMETERS Shift,X,Y

PROCEDURE OnDblClick(oEdit,Shift,X,Y)
RETURN

<SCRIPT EVENT="DblClick(Shift,X,Y)" LANGUAGE="JScript">
</SCRIPT>

<SCRIPT LANGUAGE="VBScript">
Function DblClick(Shift,X,Y)
End Function
</SCRIPT>

Procedure OnComDblClick Short llShift OLE_XPOS_PIXELS llX OLE_YPOS_PIXELS llY
	Forward Send OnComDblClick llShift llX llY
End_Procedure

METHOD OCX_DblClick(Shift,X,Y) CLASS MainDialog
RETURN NIL

void onEvent_DblClick(int _Shift,int _X,int _Y)
{
}

function DblClick as v (Shift as N,X as OLE::Exontrol.Edit.1::OLE_XPOS_PIXELS,Y as OLE::Exontrol.Edit.1::OLE_YPOS_PIXELS)
end function

function nativeObject_DblClick(Shift,X,Y)
return

The following VB sample displays the line double clicked:

Private Sub Edit1_DblClick(Shift As Integer, X As Single, Y As Single)
    With Edit1
        Dim i As Long, c As Long
        .ClientToCursor X / Screen.TwipsPerPixelX, Y / Screen.TwipsPerPixelY, c, i
        If (i > 0) Then
            Debug.Print .TextLine(i)
        End If
    End With
End Sub

The following C++ sample displays the line that user double clicks:

void OnDblClickEdit1(short Shift, long X, long Y) 
{
	long nLine = 0, nColumn = 0;
	m_edit.ClientToCursor( X, Y, &nColumn, &nLine );
	if ( nLine > 0 )
		OutputDebugString( m_edit.GetTextLine( nLine ) );
}

The following VB.NET sample displays the line that user double clicks:

Private Sub AxEdit1_DblClick(ByVal sender As Object, ByVal e As AxEXEDITLib._IEditEvents_DblClickEvent) Handles AxEdit1.DblClick
    With AxEdit1
        Dim i As Integer, c As Integer
        .ClientToCursor(e.x, e.y, c, i)
        If (i > 0) Then
            Debug.WriteLine(.get_TextLine(i))
        End If
    End With
End Sub

The following C# sample displays the line that user double clicks:

private void axEdit1_DblClick(object sender, AxEXEDITLib._IEditEvents_DblClickEvent e)
{
	int iLine = 0, iColumn = 0;
	axEdit1.ClientToCursor(e.x, e.y, out iColumn, out iLine);
	if ( iLine > 0 )
		System.Diagnostics.Debug.WriteLine(axEdit1.get_TextLine(iLine));
}

The following VFP sample displays the line that user double clicks:

*** ActiveX Control Event ***
LPARAMETERS shift, x, y

with thisform.Edit1
	local i, c
	i = 0
	c = 0
	.ClientToCursor(x, y, @c, @i)
	If (i > 0) Then
    	wait window nowait .TextLine(i)
	EndIf
endwith