C#

private void Toolbar_Hover(object sender, EventArgs e)
{
//...
ToolBarButton b = sender as ToolBarButton;
if(b != null)
//...
}

public class MyToolBar : ToolBar
{
  public ToolBarButton HitTest(Point p)
  {
    IntPtr retval = SendMessage(Handle, TB_HITTEST, IntPtr.Zero, p);
    int index = retval.ToInt32();
    if (index >= 0)
    {
      // The index is of the first non-separator, so we have to loop
      // over the toolbar buttons ourselves.
      foreach (ToolBarButton button in Buttons)
        if (button.Style != ToolBarButtonStyle.Separator)
          if (index-- == 0) return button;
    }
    return null;
  }
  [DllImport("user32.dll")]
  private static extern IntPtr SendMessage(IntPtr hWnd, uint msg,
    IntPtr wParam, ref Point p);
  private const int TB_HITTEST = 0x0445;
}

myToolBar1.MouseHover += new EventHandler(myToolBar1_MouseHover);
// ...
private void myToolBar1_MouseHover(object sender, EventArgs e)
{
  Point p = Control.MousePosition;
  p = myToolBar1.PointToClient(p);
  ToolBarButton button = myToolBar1.HitTest(p);
  if (button != null) MessageBox.Show("You're over the " + button.Text +
    " button.");
}

1. Google like a madman for "Direct3D 9.0 tutorials"
2. Download the DirectX SDK documentation
3. Look heavily into the following areas:
   - Microsoft.DirectX.Direct3D.VertexBuffer
   - Microsoft.DirectX.Direct3D.Device
   - Microsoft.DirectX.Direct3D.Texture
   - Microsoft.DirectX.Direct3D.Transforms
   - Vector3.Unproject and Vector3.Project

rtb2.SelectionLength = 0
rtb2.SelectionStart = rtb2.Text.Length()
rtb2.Focus()
rtb2.ScrollToCaret()

private const short SQL_HANDLE_ENV = 1;
private const short SQL_HANDLE_DBC = 2;
private const int SQL_ATTR_ODBC_VERSION = 200;
private const int SQL_OV_ODBC3 = 3;
private const short SQL_SUCCESS = 0;
private const short SQL_NEED_DATA = 99;
private const short DEFAULT_RESULT_SIZE = 1024;
private const string SQL_DRIVER_STR = "DRIVER=SQL SERVER";
[DllImport("odbc32.dll")]
private static extern short SQLAllocHandle(short hType, IntPtr inputHandle, out IntPtr outputHandle);
[DllImport("odbc32.dll")]
private static extern short SQLSetEnvAttr(IntPtr henv, int attribute, IntPtr valuePtr, int strLength);
[DllImport("odbc32.dll")]
private static extern short SQLFreeHandle(short hType, IntPtr handle); 
[DllImport("odbc32.dll",CharSet=CharSet.Ansi)]
private static extern short SQLBrowseConnect(IntPtr hconn, StringBuilder inString, 
	short inStringLength, StringBuilder outString, short outStringLength,
	out short outLengthNeeded);

static public string[] GetSQLServers()
{
	string[] retval = null;
	string txt = string.Empty;
	IntPtr henv = IntPtr.Zero;
	IntPtr hconn = IntPtr.Zero;
	StringBuilder inString = new StringBuilder(SQL_DRIVER_STR);
	StringBuilder outString = new StringBuilder(DEFAULT_RESULT_SIZE);
	short inStringLength = (short) inString.Length;
	short lenNeeded = 0;

	try
	{
		if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_ENV, henv, out henv))
		{
			if (SQL_SUCCESS == SQLSetEnvAttr(henv,SQL_ATTR_ODBC_VERSION,(IntPtr)SQL_OV_ODBC3,0))
			{
				if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_DBC, henv, out hconn))
				{
					if (SQL_NEED_DATA ==  SQLBrowseConnect(hconn, inString, inStringLength, outString, 
								DEFAULT_RESULT_SIZE, out lenNeeded))
					{
						if (DEFAULT_RESULT_SIZE < lenNeeded)
						{
							outString.Capacity = lenNeeded;
							if (SQL_NEED_DATA != SQLBrowseConnect(hconn, inString, inStringLength, outString, 
								lenNeeded,out lenNeeded))
							{
								throw new ApplicationException("Unabled to aquire SQL Servers from ODBC driver.");
							}	
						}
						txt = outString.ToString();
						int start = txt.IndexOf("{") + 1;
						int len = txt.IndexOf("}") - start;
						if ((start > 0) && (len > 0))
						{
							txt = txt.Substring(start,len);
						}
						else
						{
							txt = string.Empty;
						}
					}						
				}
			}
		}
	}
	catch (Exception)
	{
		//Throw away any error if we are not in debug mode
		txt = string.Empty;
	}
	finally
	{
		if (hconn != IntPtr.Zero)
		{
			SQLFreeHandle(SQL_HANDLE_DBC,hconn);
		}
		if (henv != IntPtr.Zero)
		{
			SQLFreeHandle(SQL_HANDLE_ENV,hconn);
		}
	}
	
	if (txt.Length > 0)
	{
		retval = txt.Split(",".ToCharArray());
	}

	return retval;
}