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    <p>Referencing <a href="https://stackoverflow.com/questions/124975/windows-forms-textbox-that-has-line-numbers#125093">Wayne's post</a>, here is the relevant code. It is using GDI to draw line numbers next to the text box.</p> <pre><code>Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() 'Add any initialization after the InitializeComponent() call SetStyle(ControlStyles.UserPaint, True) SetStyle(ControlStyles.AllPaintingInWmPaint, True) SetStyle(ControlStyles.DoubleBuffer, True) SetStyle(ControlStyles.ResizeRedraw, True) End Sub Private Sub RichTextBox1_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles RichTextBox1.SelectionChanged FindLine() Invalidate() End Sub Private Sub FindLine() Dim intChar As Integer intChar = RichTextBox1.GetCharIndexFromPosition(New Point(0, 0)) intLine = RichTextBox1.GetLineFromCharIndex(intChar) End Sub Private Sub DrawLines(ByVal g As Graphics, ByVal intLine As Integer) Dim intCounter As Integer, intY As Integer g.Clear(Color.Black) intCounter = intLine + 1 intY = 2 Do g.DrawString(intCounter.ToString(), Font, Brushes.White, 3, intY) intCounter += 1 intY += Font.Height + 1 If intY &gt; ClientRectangle.Height - 15 Then Exit Do Loop End Sub Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) DrawLines(e.Graphics, intLine) End Sub Private Sub RichTextBox1_VScroll(ByVal sender As Object, ByVal e As System.EventArgs) Handles RichTextBox1.VScroll FindLine() Invalidate() End Sub Private Sub RichTextBox1_UserScroll() Handles RichTextBox1.UserScroll FindLine() Invalidate() End Sub </code></pre> <p>The RichTextBox is overridden like this:</p> <pre><code>Public Class UserControl1 Inherits System.Windows.Forms.RichTextBox Public Event UserScroll() Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message) If m.Msg = &amp;H115 Then RaiseEvent UserScroll() End If MyBase.WndProc(m) End Sub End Class </code></pre> <p>(Code by divil on the xtremedotnettalk.com forum.)</p>
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    1. COis this doable in C# as well?
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    2. COyes, http://www.developerfusion.com/tools/convert/vb-to-csharp/ should get you started. if you get it working you should post it as an answer as a resource for others.
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    3. COIs this 'pure' .NET?
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      1. USAgnel Kurian
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

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