About reading from Clipboard

[Tony Johansson]

Hello!!

I'm reading a book and there is something that I have found that may me
unnessessary.

It's a method called ReadClipboard listed below.
It read an object from the Clipboard and return it if it's valid RTF format.
It makes three checks which are:
1. Get whatever's in the clipboard.
2. Get the data out, but make sure that's it RTF data
3. OK, we got something; make absolutely sure that it's a string

Now to my question.
When the code make this second check that the object is in RTF format
is it then nessessary to make the third check. I mean but I'm not sure that
if it's in
RTF format it's also a string.
If this is true then the third check can be removed.

So will the code still be correct if the third check is removed?

private string ReadClipboard()
{
// get whatever's on the clipboard
IDataObject data = Clipboard.GetDataObject();
if (data == null)
{
return null;
}

// get the data out, but make sure that's it RTF data
object o = data.GetData(DataFormats.Rtf, true);
if (o == null)
{
return null;
}

// OK, we got something; make absolutely sure that it's a string
if ((o is string) == false)
{
return null;
}

// that's it - we got something
return (string)o;
}

//Tony