Program on Vista an Xp

[iwtbapd]

I develop a program with ADO.NET on Vista.
But when i bring it on a computer with Xp it does not run.
Have i add any component to run my program on xp computer

[MNovy]

it would be so cool, if you could tell as, what problem arises?

Which .NET version you are using? Vista has .NET 3.x default, XP requires installation of any framework.