In Dropdown list, you can see one item at a time only. If you are asking how to limit the number of drop down rows to 10, you can't. The ASP .NET DropDownList renders as an HTML Select and it displays all items when the dropdown button is clicked.
However, if you are talking about list box then ,
Increase or Decrease the height of the listbox so that it shows more or less items...
The ASP.NET worker process. Source: http://www.developerzen.com/2005/02/
It really varies...
It can be $30-$65/hour
$45k - $125k
It can go higher depending on skill and experience.
Windows Server 2008 was released in February 2008. The next operating system release is expected to be Windows 7 in October 2009.