Use the SelectedObject property to retrieve a collection of selected bars or/and links.  The ChartSelectionChanged event notifies your application when the user select objects like bars or links in the chart area. Use the AllowSelectObjects property to specify whether the user can select bars or/and links at runtime, using the mouse.  Use the ItemBar(exBarSelected) property to select or unselect programmatically a bar. Use the Link(exLinkSelected) property to select or unselect programmatically a link. Use the RemoveSelection property to remove objects in the chart's selection. Use the ExecuteTemplate property to execute and returns the result of a x-script for the /COM version. 

On the bottom of the page you can find samples for using the /NET Assembly or /WPF component. The newer versions of the /NET, WPF version provides the get_SelectedBars and get_SelectedLinks properties that returns a collection of selected bars and links, beside the get_SelectedObjects property that may returns all objects being selected in the Chart area.

In the /COM version let's say that you want to retrieve the name of the bars, in this case you need to build the s-script "Items.ItemBar(<%BAR%>,0)" where the <%BAR%> should be replaced with the strings in the collection being returned by the SelectedObjects property, and 0 indicates the exBarName. Once you built this string, you just call the ExecuteTemplate property and so the name of the bar is returned for each bar selected as shown in the bellow samples. Instead, if links are returned, and you want to access a property of the link, you need to build the x-script "Items.Link(<%LINK%>,12)"  where it gets the text being assigned to selected links, as 12 indicates the exLinkText.

The following VB sample displays the list of selected bars:

    Dim c As Variant
    For Each c In G2antt1.Items.SelectedObjects(exSelectBarsOnly)
        Debug.Print c
    Next

The following VB sample displays the name of the bars being selected:

    Dim c As Variant
    With G2antt1
        For Each c In .Items.SelectedObjects(exSelectBarsOnly)
            Debug.Print .ExecuteTemplate("Items.ItemBar(" & c & "," & exBarName & ")")
        Next
    End With

The following VB sample removes the selected links only:

With G2antt1
    .BeginUpdate
    With .Items
        For Each l In .SelectedObjects(exSelectLinksOnly)
            G2antt1.Template = "Items.RemoveLink(" & l & ")"
        Next
    End With
    .EndUpdate
End With

The following VB sample removes the selected bars only:

With G2antt1
    .BeginUpdate
    With .Items
        For Each b In .SelectedObjects(exSelectBarsOnly)
            G2antt1.Template = "Items.RemoveBar(" & b & ")"
        Next
    End With
    .EndUpdate
End With

When a bar is removed, any link related to it will be removed.

The following VB.NET sample displays the list of selected bars ( applicable to COM inserted to NET forms ):

	Dim c As String
	For Each c In AxG2antt1.Items.SelectedObjects(EXG2ANTTLib.SelectObjectsEnum.exSelectBarsOnly)
	   Debug.Print(c)
	Next

The following VB.NET sample displays the name of the bars being selected ( applicable to COM inserted to NET forms ):

    Dim c As String
    With AxG2antt1
        For Each c In .Items.SelectedObjects(EXG2ANTTLib.SelectObjectsEnum.exSelectBarsOnly)
            Dim t As String = "Items.ItemBar(" + c + "," + Int(EXG2ANTTLib.ItemBarPropertyEnum.exBarName).ToString() + ")"
            Debug.Print(.ExecuteTemplate(t))
        Next
    End With

The following C# sample displays the list of selected bars ( applicable to COM inserted to NET forms ):

    foreach (string c in axG2antt1.Items.get_SelectedObjects(EXG2ANTTLib.SelectObjectsEnum.exSelectBarsOnly) as Array ) 
    {
        System.Diagnostics.Debug.WriteLine( c );
    }

The following C# sample displays the name of the bars being selected ( applicable to NET assemblies inserted to NET forms ):

exontrol.EXG2ANTTLib.Items items = exg2antt1.Items;
foreach(string bar in items.get_SelectedObjects(exontrol.EXG2ANTTLib.SelectObjectsEnum.exSelectBarsOnly) as Array)
{
	string[] s = bar.Split(new Char[] {','});
	System.Diagnostics.Debug.Print(items.get_ItemBar(Int32.Parse(s[0]), s[1].Substring(0, s[1].Length-2), exontrol.EXG2ANTTLib.ItemBarPropertyEnum.exBarName).ToString());
}

The following VB.NET sample displays the name of the bars being selected ( applicable to NET assemblies inserted to NET forms ):

With Exg2antt1.Items
    Dim bar As String, s As String()
    For Each bar In CType(.get_SelectedObjects(exontrol.EXG2ANTTLib.SelectObjectsEnum.exSelectBarsOnly), Object())
        s = Split(bar, ",")
        Debug.Print(.get_ItemBar(CInt(s(0)), Mid(s(1), 2, Len(s(1)) - 2), exontrol.EXG2ANTTLib.ItemBarPropertyEnum.exBarName).ToString())
    Next
End With

The following C++ sample displays the list of selected bars:

#include "Items.h"
{
	COleVariant vtSelected = m_g2antt.GetItems().GetSelectedObjects( 1 ); //exSelectBarsOnly
	if ( V_VT( &vtSelected ) & VT_ARRAY | VT_VARIANT )
	{
		SAFEARRAY* pArray = V_ARRAY( &vtSelected );
		void* pData = NULL;
		if ( SUCCEEDED( SafeArrayAccessData( pArray, &pData ) ) )
		{
			VARIANT* p = (VARIANT*)pData;
			for ( long i = 0; i < (long)pArray->rgsabound[0].cElements ; i++, p++ )
				OutputDebugString( V2S( p ) );
			SafeArrayUnaccessData( pArray );
		}
	}
}

The following C++ sample displays the name of the bars being selected:

#include "Items.h"
{
	COleVariant vtSelected = m_g2antt.GetItems().GetSelectedObjects( 1 /*exSelectBarsOnly*/ );
	if ( V_VT( &vtSelected ) & VT_ARRAY | VT_VARIANT )
	{
		SAFEARRAY* pArray = V_ARRAY( &vtSelected );
		void* pData = NULL;
		if ( SUCCEEDED( SafeArrayAccessData( pArray, &pData ) ) )
		{
			VARIANT* p = (VARIANT*)pData;
			for ( long i = 0; i < (long)pArray->rgsabound[0].cElements ; i++, p++ )
			{
				CString strT = "Items.ItemBar(" + V2S( p ) + ",0)"; /*builds the Items.ItemBar(Handle,Key,exBarName) template*/
				OutputDebugString( V2S( &m_g2antt.ExecuteTemplate( strT ) ) );
			}
			SafeArrayUnaccessData( pArray );
		}
	}
}

where the V2S string may look like follows:

static CString V2S( VARIANT* pv, LPCTSTR szDefault = _T("") )
{
	if ( pv )
	{
		if ( pv->vt == VT_ERROR )
			return szDefault;

		COleVariant vt;
		vt.ChangeType( VT_BSTR, pv );
		return V_BSTR( &vt );
	}
	return szDefault;
}

or

static string V2S( VARIANT* pv, LPCTSTR szDefault = _T("") )
{
	if ( pv )
	{
		if ( pv->vt == VT_ERROR )
			return szDefault;

		CComVariant vt;
		if ( SUCCEEDED( vt.ChangeType( VT_BSTR, pv ) ) )
		{
			USES_CONVERSION;
			return OLE2T(V_BSTR( &vt ));
		}
	}
	return szDefault;
}

The following VFP sample displays the list of selected bars:

local c
For Each c In thisform.G2antt1.Items.SelectedObjects(1)
	wait window c
Next

The following VFP sample displays the name of the bars being selected:

local c
For Each c In thisform.G2antt1.Items.SelectedObjects(1)
	local t
	t = "Items.ItemBar(" + c + ",0)"
	wait window thisform.G2antt1.ExecuteTemplate(t)
Next

In the /NET assembly you can use the Items.get_ItemBar or Items.set_ItemBar to access properties of the bar giving its handle and key.  The key of the bar is contained between " characters so if you are using the ItemBar property make sure that you are removing the " characters from start and end position. The get_SelectedObjects property retrieves an array of string objects. If the string starts with the " character it means that it is a link, else it is a bar. The name of the link is contained between " characters, while the bar information contains the handle of the item and the key of the bar as (item,"key"), where the item is the handle of the item, while the key is the key of the bar.

The following C# sample changes the color of the selected bar(s):

private void exg2antt1_ChartSelectionChanged(object sender)
{
    foreach (string o in exg2antt1.Items.get_SelectedObjects(exontrol.EXG2ANTTLib.SelectObjectsEnum.exSelectBarsOnly) as Array)
    {
        String[] b = o.Split(",".ToCharArray());
        exg2antt1.Items.set_BarColor( int.Parse(b[0]), b[1].Substring(1,b[1].Length -2), Color.Red );
    }
}

The following C# sample changes the color of the selected link(s):

private void exg2antt1_ChartSelectionChanged(object sender)
{
    foreach (string o in exg2antt1.Items.get_SelectedObjects(exontrol.EXG2ANTTLib.SelectObjectsEnum.exSelectLinksOnly) as Array)
    {
        exg2antt1.Items.set_Link(o.Substring(1, o.Length - 2), exontrol.EXG2ANTTLib.LinkPropertyEnum.exLinkColor, ColorTranslator.ToWin32(Color.Red));
    }
}

The following VB.NET sample changes the color of the selected bar(s):

Private Sub Exg2antt1_ChartSelectionChanged(ByVal sender As System.Object) Handles Exg2antt1.ChartSelectionChanged
    Dim o As String
    For Each o In Exg2antt1.Items.get_SelectedObjects(exontrol.EXG2ANTTLib.SelectObjectsEnum.exSelectBarsOnly)
        Dim b As String() = o.Split(",".ToCharArray())
        Exg2antt1.Items.set_BarColor(CInt(b(0)), b(1).Substring(1, b(1).Length - 2), Color.Red)
    Next
End Sub

The following VB.NET sample changes the color of the selected link(s):

Private Sub Exg2antt1_ChartSelectionChanged(ByVal sender As System.Object) Handles Exg2antt1.ChartSelectionChanged
    Dim o As String = ""
    For Each o In Exg2antt1.Items.get_SelectedObjects(exontrol.EXG2ANTTLib.SelectObjectsEnum.exSelectLinksOnly)
        Exg2antt1.Items.set_Link(o.Substring(1, o.Length - 2), exontrol.EXG2ANTTLib.LinkPropertyEnum.exLinkColor, ColorTranslator.ToWin32(Color.Red))
    Next
End Sub

The newer versions of the /NET,WPF version provides the get_SelectedBars and get_SelectedLinks properties that returns a collection of selected bars and links.

The following C# sample changes the color of the selected bar(s):

private void exg2antt1_ChartSelectionChanged(object sender)
{
    List<exontrol.EXG2ANTTLib.Items.SelectedBar> sBars = exg2antt1.Items.get_SelectedBars();
    if (sBars != null)
        foreach (exontrol.EXG2ANTTLib.Items.SelectedBar bar in sBars)
            exg2antt1.Items.set_BarColor(bar.Item, bar.Key, Color.Red);
}

The following C# sample changes the color of the selected link(s):

private void exg2antt1_ChartSelectionChanged(object sender)
{
    List<string> sLinks = exg2antt1.Items.get_SelectedLinks();
    if (sLinks != null)
        foreach (string link in sLinks)
            exg2antt1.Items.set_Link(link, exontrol.EXG2ANTTLib.LinkPropertyEnum.exLinkColor, ColorTranslator.ToWin32(Color.Red));
}

The following VB.NET sample changes the color of the selected bar(s):

Private Sub Exg2antt1_ChartSelectionChanged(ByVal sender As System.Object) Handles Exg2antt1.ChartSelectionChanged
    With Exg2antt1
        Dim sBars As List(Of exontrol.EXG2ANTTLib.Items.SelectedBar) = .Items.get_SelectedBars()
        If Not (sBars Is Nothing) Then
            Dim bar As exontrol.EXG2ANTTLib.Items.SelectedBar
            For Each bar In sBars
                .Items.set_BarColor(bar.Item, bar.Key, Color.Red)
            Next
        End If
    End With
End Sub

The following VB.NET sample changes the color of the selected link(s):

Private Sub Exg2antt1_ChartSelectionChanged(ByVal sender As System.Object) Handles Exg2antt1.ChartSelectionChanged
    With Exg2antt1
        Dim sLinks As List(Of String) = .Items.get_SelectedLinks()
        If Not (sLinks Is Nothing) Then
            Dim link As String
            For Each link In sLinks
                .Items.set_Link(link, exontrol.EXG2ANTTLib.LinkPropertyEnum.exLinkColor, ColorTranslator.ToWin32(Color.Red))
            Next
        End If
    End With
End Sub