The DevExpress ASP.Net spin editor control is one of those simple but extremely useful controls. I tend to use this control a lot in my projects. It basically is a text input field which only allows the user to enter numeric data. I know on the face of it does not seem revolutionary, but a few things I like about the control are:

1. Small and large increment buttons
2. Control features can be setup through markup
3. Control value can be retrieved as either a string or int/decimal value (this saves writing code that casts to a string or int/decimal)

Below is the markup for the spin edit control.

<dx:ASPxSpinEdit ID="dxspinAmount" runat="server" Height="21px" Number="0" NumberType="Integer" Increment="2" AllowNull="false" Enabled="false" >
    <SpinButtons Position="Left" ShowLargeIncrementButtons="true"></SpinButtons>
</dx:ASPxSpinEdit>