Only Numbers Allowed as Input

using UnityEngine;
using UnityEngine.UI;
using TMPro;

public class NumericInputField : MonoBehaviour
{
//I used a serialized field instead of getting component
     [SerializeField] TMP_InputField inputField;
   // private InputField inputField;

    private void Start()
    {
       // inputField = GetComponent<InputField>();

        // Add the validation function to the onValidateInput event
        inputField.onValidateInput += ValidateInput;
    }

    private char ValidateInput(string text, int charIndex, char addedChar)
    {
        // Allow digits 0-9
        if (char.IsDigit(addedChar))
        {
            return addedChar; // Accept the input
        }

        // Reject all other characters
        return '\0'; // Null character to block the input
    }
}