Xbox 360 controller values

There is a helping program called Joysticks, which shows the values of the Axis.

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How do I use those values in C#?
Like for instance:

If (4th Axis Value < 0.7)
Move Forward

Is there any way to do it?

The Input class deals with all user input, including controller axes. Your example in C# would be:

if (Input.GetAxis("Vertical") < 0.7f) {
    // move forward
}

You can find the names of all the axes/buttons and configure your own in the Input Manager.