C#

IDataObject oldData = Clipboard.GetDataObject();
// Construct your new DataObject and set it, then later...
Clipboard.SetDataObject();

IDataObject oldData = Clipboard.GetDataObject();
System.Windows.Forms.DataObject prevDat = new DataObject();

prevDat.SetData(oldData);

//
//.....
//...code for pasting operation here
//.........
//

 Clipboard.SetDataObject(prevDat,true);

IDataObject oldData = Clipboard.GetDataObject();
// Make your own DataObject. DO NOT TOUCH oldData
Clipboard.SetDataObject(oldData);

private void PasteImg(RichTextBox richTextBox1, string imageFileName)
{
	//Copy the previous clipped data
	IDataObject oldData = Clipboard.GetDataObject();



	#region Pasting the image
	if("" == imageFileName) imageFileName = @"c:\JayShared\music.bmp";


	Bitmap myBitmap = new Bitmap(imageFileName);

	// Copy the bitmap to the clipboard.
	Clipboard.SetDataObject(myBitmap, false);

	// Get the format for the object type.
	DataFormats.Format myFormat = DataFormats.GetFormat (DataFormats.Bitmap);

	// After verifying that the data can be pasted, paste
	if(richTextBox1.CanPaste(myFormat)) 
	{
		richTextBox1.Paste();
	}


	#endregion Pasting the image

	//
	//paste back the previous clipped data to the clipboard

	Clipboard.SetDataObject(oldData); //.......... Error occurs here.........


	//
}

IDataObject prevDat = Clipboard.GetDataObject();

using System;
using System.Reflection;
 
class Person
{
  static void Main()
  {
    Person p = new Person("Heath", DateTime.Parse("08/07/1978"));
    Reflect(p);
  }
 
  static void Reflect(Person p)
  {
    PropertyInfo[] props = p.GetType().GetProperties(
      BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
    if (props != null)
    {
      foreach (PropertyInfo prop in props)
      {
        object value = prop.GetValue(p, null);
        Console.WriteLine("{0} ({1}) = {2}", prop.Name, prop.PropertyType,
            value);
      }
    }
  }
 
  Person(string name, DateTime birthday)
  {
    this.name = name;
    this.birthday = birthday;
  }
 
  string name;
  DateTime birthday;
 
  public string Name
  {
    get { return name; }
    set
    {
      if (value == null) throw new ArgumentNullException();
      name = value;
    }
  }
 
  public DateTime Birthday
  {
    get { return birthday; }
    set { birthday = value; }
  }
}