Use the FormatColumn event to display a string different than the CellCaption property. The FormatColumn event is fired only if the FireFormatColumn property of the Column is True. The FormatColumn event lets the user to provide the cell's caption before it is displayed on the control's list. For instance, the FormatColumn event is useful when the column cells contains prices( numbers ), and you want to display that column formatted as currency, like $50 instead 50. Also, you can use the FormatColumn event to display item's index in the column, or to display the result of some operations based on the cells in the item ( totals, currency conversion and so on ).

private void FormatColumn(object sender,int Item,int ColIndex,ref object Value)
{
}

Private Sub FormatColumn(ByVal sender As System.Object,ByVal Item As Integer,ByVal ColIndex As Integer,ByRef Value As Object) Handles FormatColumn
End Sub

private void FormatColumn(object sender, AxEXGANTTLib._IGanttEvents_FormatColumnEvent e)
{
}

void OnFormatColumn(long Item,long ColIndex,VARIANT FAR* Value)
{
}

void __fastcall FormatColumn(TObject *Sender,Exganttlib_tlb::HITEM Item,long ColIndex,Variant * Value)
{
}

procedure FormatColumn(ASender: TObject; Item : HITEM;ColIndex : Integer;var Value : OleVariant);
begin
end;

procedure FormatColumn(sender: System.Object; e: AxEXGANTTLib._IGanttEvents_FormatColumnEvent);
begin
end;

begin event FormatColumn(long Item,long ColIndex,any Value)
end event FormatColumn

Private Sub FormatColumn(ByVal sender As System.Object, ByVal e As AxEXGANTTLib._IGanttEvents_FormatColumnEvent) Handles FormatColumn
End Sub

Private Sub FormatColumn(ByVal Item As EXGANTTLibCtl.HITEM,ByVal ColIndex As Long,Value As Variant)
End Sub

Private Sub FormatColumn(ByVal Item As Long,ByVal ColIndex As Long,Value As Variant)
End Sub

LPARAMETERS Item,ColIndex,Value

PROCEDURE OnFormatColumn(oGantt,Item,ColIndex,Value)
RETURN

<SCRIPT EVENT="FormatColumn(Item,ColIndex,Value)" LANGUAGE="JScript">
</SCRIPT>

<SCRIPT LANGUAGE="VBScript">
Function FormatColumn(Item,ColIndex,Value)
End Function
</SCRIPT>

Procedure OnComFormatColumn HITEM llItem Integer llColIndex Variant llValue
	Forward Send OnComFormatColumn llItem llColIndex llValue
End_Procedure

METHOD OCX_FormatColumn(Item,ColIndex,Value) CLASS MainDialog
RETURN NIL

void onEvent_FormatColumn(int _Item,int _ColIndex,COMVariant /*variant*/ _Value)
{
}

function FormatColumn as v (Item as OLE::Exontrol.Gantt.1::HITEM,ColIndex as N,Value as A)
end function

function nativeObject_FormatColumn(Item,ColIndex,Value)
return

The following VB samples use the FormatCurrency function, to display a number as a currency. The FormatCurrency VB function returns an expression formatted as a currency value using the currency symbol defined in the system control panel.

Gantt1.Columns("Freight").FireFormatColumn = True
Gantt1.Columns("Freight").HeaderBold = True
Gantt1.Columns("Freight").Alignment = RightAlignment

Private Sub Gantt1_FormatColumn(ByVal Item As EXGANTTLibCtl.HITEM, ByVal ColIndex As Long, Value As Variant)

     Value = FormatCurrency(Value, 2) ' The FormatCurrency is a VB function

End Sub

Gantt1.Columns("Freight").FireFormatColumn = False
Gantt1.Columns("Freight").HeaderBold = True
Gantt1.Columns("Freight").Alignment = RightAlignment

For instance, you can use the FormatColumn event to display "Yes" or "No" caption for a boolean column. The following VB sample shows how to do it:

Private Sub Gantt1_FormatColumn(ByVal Item As EXGANTTLibCtl.HITEM, ByVal ColIndex As Long, Value As Variant)
    Value = IIf(Value < 50, "Yes", "No")
End Sub

The following VB sample displays the result of adding ( concatenating ) of two cells:

Private Sub Gantt1_FormatColumn(ByVal Item As EXGANTTLibCtl.HITEM, ByVal ColIndex As Long, Value As Variant)
    With Gantt1.Items
        Value = .CellCaption(Item, 0) + .CellCaption(Item, 1)
    End With
End Sub

The following C++ sample displays a date column using a format like "Saturday, January 31, 2004":

void OnFormatColumnGantt1(long Item, long ColIndex, VARIANT FAR* Value) 
{
	COleDateTime date( *Value );
	COleVariant vtNewValue( date.Format( _T("%A, %B %d, %Y") ) );
	VariantCopy( Value, vtNewValue );
}

The following VB.NET sample displays a date column using LongDate format:

Private Sub AxGantt1_FormatColumn(ByVal sender As Object, ByVal e As AxEXGANTTLib._IGanttEvents_FormatColumnEvent) Handles AxGantt1.FormatColumn
    e.value = DateTime.Parse(e.value).ToLongDateString()
End Sub

The following C# sample displays a date column using LongDate format:

private void axGantt1_FormatColumn(object sender, AxEXGANTTLib._IGanttEvents_FormatColumnEvent e)
{
	e.value = DateTime.Parse(e.value.ToString()).ToLongDateString();
}

The following VFP sample displays the item's index using the FormatColumn event:

*** ActiveX Control Event ***
LPARAMETERS item, colindex, value

with thisform.Gantt1.Items
	.DefaultItem = item
	value = .ItemToIndex(0)
endwith

before running the sample please make sure that the :

application.AutoYield = .f.

is called during the Form.Init event.