C#

x.Equals(x) returns true, except in cases that involve floating-point types. See IEC 60559:1989, Binary Floating-point Arithmetic for Microprocessor Systems.

double d = Double.NaN;
d.Equals(d); // is still true - although it doesn't have to be under the standard

private void button1_Click(object sender, EventArgs e)
{
    //My functionality here
}

<br />
if (o is DictionaryEntry)<br />
{<br />
	DictionaryEntry oEntry = (DictionaryEntry)o;<br />
	object oKey = oEntry.Key;<br />
	object oValue = oEntry.Value;<br />
	<br />
	// In this case lstAnotherCollection is a Hashtable<br />
	lstAnotherCollection.Add(oKey, oValue);<br />
	... more ...<br />
}<br />
else if (o is KeyValuePair<string, System.Drawing.Bitmap>)<br />
{<br />
	// This would give error ...<br />
	// KeyValuePair<object, object> oEntry = (KeyValuePair<object, object>)o;<br />
	<br />
	// To resolve this, I resorted to else-elseif blocks (That's obviously undersirable)<br />
	KeyValuePair<string, System.Drawing.Bitmap> oEntry = (KeyValuePair<string, System.Drawing.Bitmap>)o;<br />
	string oKey = oEntry.Key;<br />
	System.Drawing.Bitmap oValue = oEntry.Value;<br />
	<br />
	// lstAnotherCollection = Dictionary<Object, Object><br />
	lstAnotherCollection.Add(oKey, oValue);<br />
	... more ...<br />
}<br />
... many more else-if blocks ...<br />