can you write a program in c# so that when user mouseover on any existing unityui buttons it will show its class name

Sure! Here's an example of how you can achieve that in C# using Unity:

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class ButtonHoverInfo : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
{
    private Text classNameText;

    private void Start()
    {
        // Assuming you have a Text component to show the class name
        classNameText = GameObject.Find("ClassNameText").GetComponent<Text>();
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        // Get the class name of the button and display it
        classNameText.text = gameObject.GetType().ToString();
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        // Clear the class name when the mouse exits the button
        classNameText.text = "";
    }
}

In this example, we implement the IPointerEnterHandler and IPointerExitHandler interfaces to detect when the mouse pointer enters or exits a button. When the mouse hovers over a button, the OnPointerEnter method is called, where we get the class name of the button using gameObject.GetType().ToString() and display it in a Text component called "ClassNameText". When the mouse pointer exits the button, the OnPointerExit method is called to clear the class name from the Text component.

Make sure to attach this script to each of your Unity.UI buttons that you want to monitor for class names. Also, don't forget to create a Text component called "ClassNameText" to display the class name