C#

myTab.SelectedIndexChanging += new TabControlCancelEventHandler(myTab_SelectedIndexChanging);

private void myTabSelectedIndexChanging(object sender, TabControlCancelEventArgs e)
{
    if(validation fails)
        e.Cancel = true;
}

namespace BlaBla {
    class MyForm : System.Windows.Forms.Form {
        cursor GetCursor {
            // Both ways will look for the recource: Cursor.ico

            // When you get a stream from the Assembly, you have to specify
            // the namespace also. But the constructor from the second example
            // does that for you.
            // NOTE: This is the way it works in VB, because you can give the whole
            //       project a default namespace (in this case BlaBla). I don't          
            //       know if this works this way in C#...
            IO.Stream stream = Reflection.Assembly.GetCurrentAssembly. 
                               GetManifestResourceStream("BlaBla.Cursor.ico")
            cur = new Cursor(stream);
            stream.Close();

            // This constructor gets the namespace from the first parameter,
            // so you don't have to specify the namespace also.
            Cursor cur = new cursor(this.GetType(), "Cursor.ico"); 
            
            return cur;
        }
    }
}

if(cursorMovingCol == null)<br />
  cursorMovingCol = new System.Windows.Forms.Cursor(GetType(), "DataListTest.movingCol.cur");

An unhandled exception of type 'System.ArgumentNullException' occurred in system.windows.forms.dll<br />
<br />
Additional information: Value cannot be null.

static Cursor Getcursor{<br />
   System.IO.Stream stream = System.Reflection.Assembly.GetExecutingAssembly.GetManifestResourceStream("movingCol.cur");<br />
   System.Windows.Forms.Cursor cur = new Cursor(stream);<br />
   stream.Close();<br />
   return cur;<br />
}

private static System.Windows.Forms.Cursor GetCursor()<br />
{<br />
  System.IO.Stream stream = System.Reflection.Assembly.GetExecutingAssembly()<br />
    .GetManifestResourceStream("movingCol.cur");<br />
  System.Windows.Forms.Cursor cur = new System.Windows.Forms.Cursor(stream);<br />
  stream.Close();<br />
  return cur;<br />
}

String() res = Reflection.Assembly.GetExecutingAssembly.GetManifestResourceNames();
int i;
for (i=0; i<res.Length; i++){
    Console.WriteLine(res(i))
}

      foreach(string strManifestResourceName in System.Reflection.Assembly.GetEntryAssembly()<br />
          .GetManifestResourceNames())<br />
        System.Diagnostics.Trace.WriteLine("Found Resource: " + strManifestResourceName);<br />
<br />
      System.IO.Stream stream = System.Reflection.Assembly.GetExecutingAssembly()<br />
        .GetManifestResourceStream("movingCol.cur");<br />
      System.Windows.Forms.Cursor cur = new System.Windows.Forms.Cursor(stream);<br />
      stream.Close();<br />
      return cur;

Found Resource: DataListTest.res.movingCol.cur<br />
Found Resource: DataListTest.Form1.resources<br />
Found Resource: DataListTest.dataListHeaderCtrl.resources<br />
Found Resource: DataListTest.dataListCtrl.resources<br />
Found Resource: DataListTest.dataListHeaderCtrlNoChild.resources