C#

private void sourceControl_MouseMove(object sender, MouseEventArgs e)
{
    /*
    code to detect dragging
    ...
    */
    
    // start the drag-drop operation
    sourceControl.DoDragDrop(someText, DragDropEffects.Copy | 
        DragDropEffects.Move);
}

myUserControl1.DataBindings.Add("SelectedValue", dataSet1, "DataTable1");

this.DataBindings.Add("SelectedValue", dataSet1, "Table1.ID");

private void button1_Click(object sender, System.EventArgs e)
{
  CurrencyManager cm = (CurrencyManager)this.BindingContext
    [this.dataSet1.Table1]; // typed dataset, so table is a prop
  if (cm != null)
    if (cm.Position >= 1) cm.Position--;
}

private void button2_Click(object sender, System.EventArgs e)
{
  CurrencyManager cm = (CurrencyManager)this.BindingContext
    [this.dataSet1.Table1]; // typed dataset, so table is a prop
  if (cm != null)
    if (cm.Position < cm.Count - 1) cm.Position++;
}

<br />
string o="";<br />
BindingManagerBase bindingManager = this.BindingContext[DataSet, "table"];<br />
foreach(Binding b in bindingManager.Bindings)<br />
{<br />
     o += b.Control.ToString() + "\n";<br />
}<br />
MessageBox.Show(o);<br />

<br />
public class lp2 : System.Windows.Forms.ComboBox<br />
{<br />
	// Our Variables<br />
	private SqlDataAdapter dataAdapter;<br />
	private SqlConnection sqlConnection;<br />
	private DataSet dataset;<br />
	/// <summary> <br />
	/// Required designer variable.<br />
	/// </summary><br />
	private System.ComponentModel.Container components = null;<br />
<br />
	public lp2()<br />
	{<br />
 	// This call is required by the Windows.Forms Form Designer.<br />
	InitializeComponent();<br />
		// TODO: Add any initialization after the InitializeComponent call<br />
	sqlConnection = Utilities.dbUtilities.getWebDbCn();<br />
	string selectCommand = "select * from lang";<br />
	dataset = new DataSet();<br />
	dataAdapter = new SqlDataAdapter(selectCommand, sqlConnection);<br />
	dataAdapter.Fill(dataset, "lang");<br />
	this.DataSource = dataset;<br />
	this.DisplayMember = "lang.langText";<br />
	this.ValueMember = "lang.lang";<br />
<br />
}<br />
}<br />

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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.");
}