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no to prompt the user to go to tab 2 
 
Using Microsoft visual studio 8 and vb.net
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And you have a listview object on tab2 , so whenever data is changed in that list view, and if user is not on tab2 (means he is on tab1), then change the tab header of tab 2 to red color, is this correct?
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Please check if the below works for you, I have a windows form in VB.NET with 2 tabs, in the 2nd tab there is a listview. And when I launch the app, the selected tab is the 1st tab by default. I have a timer in my form to simulate incoming data on tab 2, after 3 seconds, the timer elapsed is called, and I add the items to list view, and then call TabControl refresh to refresh the header. 
To draw the color of tab header in different color, in form load I have to set the Drawmode of tab to OwnerDrawFixed and handle the draw item event of tab control. In this draw item event I check if current tab is 1st tab and if new items have got added in 2nd tab then I draw second header text in Red color. See screenshots below. Also attached is the code below. 
<a href="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056488/TabHeader_Before.png" target="_blank" title="TabHeader_Before.png (5 KB)"><img alt="TabHeader_Before.png" class="file-block lazyload" style="max-width: 625px;" data-src="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056488/TabHeader_Before.png" /></a><a href="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056489/TabHeader_After.png" target="_blank" title="TabHeader_After.png (7 KB)"><img alt="TabHeader_After.png" class="file-block lazyload" style="max-width: 638px;" data-src="https://filedb.experts-exchange.com/incoming/2015/12_w51/1056489/TabHeader_After.png" /></a>
<pre><code class="code-10 nolinks" id="code-20-41376036-1">Public Class Form1
 Private _listviewtimer As New System.Timers.Timer(3000)
 Private _changetabheadercolor As Boolean = False
 
 Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
 TabControl1.DrawMode = DrawMode.OwnerDrawFixed
 _listviewtimer.Enabled = True
 _listviewtimer.AutoReset = True
 AddHandler _listviewtimer.Elapsed, AddressOf TimerElapsed
 End Sub
 Private Sub TimerElapsed(ByVal sender As Object, e As Timers.ElapsedEventArgs)
 If Me.ListView1.InvokeRequired Then
 Me.Invoke(Sub() ListView1.Items.Add(&quot;ABC&quot;))
 Me.Invoke(Sub() ListView1.Items.Add(&quot;DEF&quot;))
 Me.Invoke(Sub() ListView1.Items.Add(&quot;GHI&quot;))
 _changetabheadercolor = True
 Me.Invoke(Sub() TabControl1.Refresh())
 _listviewtimer.Stop()
 End If
 End Sub

 Private Sub TabControl1_DrawItem(sender As Object, e As DrawItemEventArgs) Handles TabControl1.DrawItem

 'Get the first tab and draw it normally
 Dim firstTab As TabPage = TabControl1.TabPages(0)

 'Get the area of the header of this TabPage
 Dim HeaderRect1 As Rectangle = TabControl1.GetTabRect(0)

 ' Create two Brushes to paint the Text
 Dim BlackTextBrush As New SolidBrush(Color.Black)
 Dim RedTextBrush As New SolidBrush(Color.Red)

 'Set the Alignment of the Text
 Dim sf As New StringFormat()
 sf.Alignment = StringAlignment.Center
 sf.LineAlignment = StringAlignment.Center
 e.Graphics.DrawString(firstTab.Text, e.Font, BlackTextBrush, HeaderRect1, sf)

 Dim secondtab As TabPage = TabControl1.TabPages(1)

 Dim HeaderRect2 As Rectangle = TabControl1.GetTabRect(1)
 ' Paint the Text using the appropriate Bold and Color setting 
 If _changetabheadercolor And TabControl1.SelectedIndex = 0 Then
 Dim BoldFont As New Font(TabControl1.Font.Name, TabControl1.Font.Size, FontStyle.Bold)
 e.Graphics.DrawString(secondtab.Text, BoldFont, RedTextBrush, HeaderRect2, sf)

 Else
 e.Graphics.DrawString(secondtab.Text, e.Font, BlackTextBrush, HeaderRect2, sf)
 End If

 ' Job done - dispose of the Brushes
 BlackTextBrush.Dispose()
 RedTextBrush.Dispose()
 
 End Sub
End Class
</code></pre>
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TabHeader_Before.png

TabHeader_After.png

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i assume you have a way to figure out that list view on tab 2 has changed, in the above example after adding the data to list view, I explicitly call TabControl.Refresh. Ideally, it would have been good if we have an event to handle in list view which has item added or removed item. To get events for item added or removed we will have to specialize the list view and write our own class, so that we get these events. 
You can look at the below article which explains how this works. 
<a href="http://www.codeproject.com/Articles/4406/An-Observer-Pattern-and-an-Extended-ListView-Event" rel="ugc">http://www.codeproject.com/Articles/4406/An-Observer-Pattern-and-an-Extended-ListView-Event</a>
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thanks good code I do have a way to check the list view or if you used a label that changed do you need all the code to just change the color as you showed in the examples tabpage1 / myheader
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To change the tab header color the main code is in draw item event and setting property of tab as owner draw fixed in form load. Other things like timer in my code is not needed if you have a way to find out of list view was modified. In draw item I have a boolean flag set to find if list view had been modified that you will have to Set it in your case at appropriate place.
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Hi in the code I check mCommentRichText.Text has a value and set warning to true I want to then run the Private Sub TabControl1_DrawItem event to change the color but the Me.Invoke(Sub() TabControl1.Refresh()) &nbsp;the word sub gives error - expression expected 
The user on the first Tab scrolls through a table and the data may have a comment or not if it does I want &nbsp;the 2nd tab to go red as in your display to prompt the user to go to the second tab 
 
 

<pre><code class="code-1 nolinks" id="code-20-41377175-1"> mCommentRichText.Text = reader1.GetString(9)

 If mCommentRichText.Text IsNot &quot;&quot; Then
 warning = True
 Else
 warning = False
 End If

 Me.Invoke(Sub() TabControl1.Refresh())
</code></pre>
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Hi Kevin which is the version of .NET framework you are using?
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Microsoft Visual Studio 2008 Version 9.0.30729.4462 QFE 
Microsoft .Net Framework Version 3.5 SP1
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Can you try this instead? I think in VS2008 there is no concept of anonymous lambda which I have used in my code earlier. 

<pre><code class="code-1 nolinks" id="code-20-41377462-1">'Add the below sub to your class
Private sub myTabRefresh()
TabControl1.Refresh()
End Sub
'Change invoke to call like below
me.Invoke(New MethodInvoker(myTabRefresh))
</code></pre>
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Worked if addressof added to invoker (if not added it gives error - methodinvoker requires an addressof expression) it activates the myTabRefresh event but still not activating the &nbsp; 
 
Private Sub mDockRecordTabControl_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles mDockRecordTabControl.DrawItem event 
 

<pre><code class="code-10 nolinks" id="code-20-41377466-1">If mCommentRichText.Text IsNot &quot;&quot; Then
 warning = True
 Me.Invoke(New MethodInvoker(AddressOf mytabrefresh))
 Else
 warning = False
 Me.Invoke(New MethodInvoker(AddressOf mytabrefresh))
 End If

 Private Sub mytabrefresh()
 TabControl1.Refresh()
 End Sub

 Private Sub TabControl1_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles mDockRecordTabControl.DrawItem

 Your Code added here
 
 end sub 
</code></pre>
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Have you set the draw mode of your tab control like below on form load? 
TabControl1.DrawMode = DrawMode.OwnerDrawFixed
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Had it turned on but must have turned off when trying to get it to work 
 
Thanks for help all works fine
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Excellent support and effort
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<div class="content wysiwyg-content">
Hi Experts 
 
I have a tabcontrol with 2 tabpages on the 2nd tab page I have a listview when there is information in the list view I would 
Like the 2nd tabpage text (Heading) color to change from black to red / bold to visually tell the user to go o the 2nd tabpage 
 
You help will be appreciated
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Hi Experts 

I have a tabcontrol with 2 tabpages on the 2nd tab page I have a listview when there is information in the list view I would
Like the 2nd tabpage text (Heading) color to change from black to red / bold to visually tell the user to go o the 2nd tabpage

You help will be appreciated

vb.net tabpage

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

Visual Basic is Microsoft’s event-driven programming language and integrated development environment (IDE) for its Component Object Model (COM) programming model. It is relatively easy to learn and use because of its graphical development features and BASIC heritage. It has been replaced with VB.NET, and is very similar to VBA (Visual Basic for Applications), the programming language for the Microsoft Office product line.