Unity UI Slider to change UI Text - c

Ok Im using unity 4.6 and have a UI slider visible to the player. Beside the slider I have a UI Text which is showing a String of 500. The Slider head is at the right hand side (500) and can be slid left towards what I want to be 0.
I have the following code in place but when i slide the slider the Text value starts at 500 and automatically changes to 0.99 and moves the whole way down to 0 on the left hand side. If i was to slide it back up to the right hand side it has a value of 1.
public class SliderUITextUpdate : MonoBehaviour {
string sliderTextString = "500";
public Text sliderText;
public void textUpdate(float textUpdateNumber)
{
sliderTextString = textUpdateNumber.ToString ();
sliderText.text = sliderTextString;
}
}
This script is attached to a Manager object (just an empty gameobject) and then the text game object is applied in the inspector.
On the slider object I am using the OnValueChanged() ability in the inspector. To which I have attached the Manager gameobject and set it to use SliderUITexture.textUpdate
Any help would be great thanks !

public class SliderUITextUpdate : MonoBehaviour {
string sliderTextString = "500";
public Text sliderText;
public Slider mainSlider;
void Awake(){
mainSlider.maxValue = 500;
}
public void textUpdate(float textUpdateNumber)
{
sliderTextString = textUpdateNumber.ToString ();
sliderText.text = sliderTextString;
}
}
get the referece for that slider in inspector

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