private void tabControl1_DrawItem(object sender, DrawItemEventArgs e)
{
 e.DrawFocusRectangle();
 e.DrawBackground();
 e.Graphics.DrawString("标签" + (e.Index + 1), SystemFonts.DefaultFont, Brushes.Black, new PointF(e.Bounds.X + 5, e.Bounds.Y +
   5));
}

Private Sub tabControl1_DrawItem(sender As Object, e As DrawItemEventArgs)
  e.DrawFocusRectangle()
  e.DrawBackground()
  e.Graphics.DrawString("标签" & Convert.ToString((e.Index + 1)), SystemFonts.DefaultFont, Brushes.Black, New PointF(e.Bounds.X + 5, e.Bounds.Y + 5))
End Sub

public partial class Form1 : Form
{
/// <summary>
/// 绑定下拉列表的Color类
/// </summary>
private class ColorInfo
{
  /// <summary>
  /// 颜色名称
  /// </summary>
  public string ColorName { get; set; }
  /// <summary>
  /// 对应的Color实体
  /// </summary>
  public Color Color { get; set; }

  public static List<ColorInfo> GetAllColors()
  {
 Color c = new Color();
 List<ColorInfo> Colors = new List<ColorInfo>();
 foreach (var item in c.GetType().GetProperties())
 {
   //排除非颜色的情况
   if (item.GetValue(c, null) is Color)
   {
 Colors.Add(new ColorInfo { ColorName = item.Name, Color = (Color)item.GetValue(c, null) });
   }
 }
 return Colors;
  }

}


public Form1()
{
  InitializeComponent();
  comboBox1.DataSource = ColorInfo.GetAllColors();
  comboBox1.DisplayMember = "ColorName";
  comboBox1.ValueMember = "Color";
}


private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
{
  e.DrawBackground();
  e.DrawFocusRectangle();
  //绘制空心矩形框，起始点（0，5），宽度60，高度10
  Rectangle r = new Rectangle(e.Bounds.X, e.Bounds.Y+5, 60, 10);
  //外框是黑色
  e.Graphics.DrawRectangle(new Pen(Color.Black),r);
  //内框用枚举出来的颜色填充
  e.Graphics.FillRectangle(new SolidBrush((comboBox1.DataSource as List<ColorInfo>)[e.Index].Color), r);
  //绘制颜色名称，起始点每项都是Item中（70，5）
  e.Graphics.DrawString((comboBox1.DataSource as List<ColorInfo>)[e.Index].ColorName, SystemFonts.DefaultFont, Brushes.Black, new PointF(e.Bounds.X + 70, e.Bounds.Y + 5));
}

}

Public Partial Class Form1
  Inherits Form
  ''' <summary>
  ''' 绑定下拉列表的Color类
  ''' </summary>
  Private Class ColorInfo
    ''' <summary>
    ''' 颜色名称
    ''' </summary>
    Public Property ColorName() As String
      Get
        Return m_ColorName
      End Get
      Set
        m_ColorName = Value
      End Set
    End Property
    Private m_ColorName As String
    ''' <summary>
    ''' 对应的Color实体
    ''' </summary>
    Public Property Color() As Color
      Get
        Return m_Color
      End Get
      Set
        m_Color = Value
      End Set
    End Property
    Private m_Color As Color

    Public Shared Function GetAllColors() As List(Of ColorInfo)
      Dim c As New Color()
      Dim Colors As New List(Of ColorInfo)()
      For Each item As var In c.[GetType]().GetProperties()
        '排除非颜色的情况
        If TypeOf item.GetValue(c, Nothing) Is Color Then
          Colors.Add(New ColorInfo() With { _
            Key .ColorName = item.Name, _
            Key .Color = DirectCast(item.GetValue(c, Nothing), Color) _
          })
        End If
      Next
      Return Colors
    End Function

  End Class


  Public Sub New()
    InitializeComponent()
    comboBox1.DataSource = ColorInfo.GetAllColors()
    comboBox1.DisplayMember = "ColorName"
    comboBox1.ValueMember = "Color"
  End Sub


  Private Sub comboBox1_DrawItem(sender As Object, e As DrawItemEventArgs)
    e.DrawBackground()
    e.DrawFocusRectangle()
    '绘制空心矩形框，起始点（0，5），宽度60，高度10
    Dim r As New Rectangle(e.Bounds.X, e.Bounds.Y + 5, 60, 10)
    '外框是黑色
    e.Graphics.DrawRectangle(New Pen(Color.Black), r)
    '内框用枚举出来的颜色填充
    e.Graphics.FillRectangle(New SolidBrush(TryCast(comboBox1.DataSource, List(Of ColorInfo))(e.Index).Color), r)
    '绘制颜色名称，起始点每项都是Item中（70，5）
    e.Graphics.DrawString(TryCast(comboBox1.DataSource, List(Of ColorInfo))(e.Index).ColorName, SystemFonts.DefaultFont, Brushes.Black, New PointF(e.Bounds.X + 70, e.Bounds.Y + 5))
  End Sub
End Class