how to checking If texture is in use in hierarchy

Hi guys i am writing a editor script for discarding unused textures from the project folder Or save unused textures to another folder

so My question is that is their a way to check that a particular texture is in use in with objects in hierarchy

i hope i made my self clear

so far i achieve this wid my code newbie coding skills

 using UnityEngine;
 using System.Collections;
 using System.IO;
 using UnityEditor;
 using System.Collections.Generic;
 
 
 
 
 public class Texture_finder : EditorWindow {
     
         List<Texture2D> textureList = new List<Texture2D>();
     
      [MenuItem("Window/Texture Test")]    
     
     
     
     public static void ShowWindow()
     {
         EditorWindow.GetWindow(typeof(Texture_finder));
         
     }
 
     
     void OnInspectorUpdate() {
        
         Repaint();
     }
     
     
     
     //-----------------------------------------------------------
     Texture2D[] AllTexture;
     Object mObject;
     string path;
     string extention = "meta";
      GameObject[] gameObjs ;
     string TextureName ;
     object[] allObjects;
      
     
     
     void Start()
     {
          
          
     }
 
     
     void OnGUI()
     {
 //****************************************************************
         GUILayout.BeginHorizontal ("box");
         GUILayout.Label("Texture Finder");
         if (GUILayout.Button("Find Texture "))
         {
             Find_text();
         }
          GUILayout.EndHorizontal ();
         
         
         GUILayout.BeginHorizontal ("box");
           mObject = EditorGUILayout.ObjectField( " drop Texture:", mObject, typeof(Texture2D), true ); 
          
     
         GUILayout.EndHorizontal ();
 //****************************************************************
     }
     
     void Find_text()
     {
         allObjects = FindObjectsOfTypeAll(typeof(GameObject)) ;
 //    Debug.Log(allObjects.Length);
         
         
         
         path = "Assets/Textures";
             
         DirectoryInfo dir = new DirectoryInfo(path);
         FileInfo[] info=dir.GetFiles("*.*");
         
         for(int i=0; i<info.Length;i++)
         {
             if(!info[i].Name.Contains(".meta") )
             {
                   foreach(GameObject Obj in allObjects)
                 {   Debug.Log (Obj);
                     if(Obj.renderer)
                     {
                     TextureName = Obj.renderer.sharedMaterial.mainTexture.name;
 Debug.Log (TextureName);
                        
                         
                         if( TextureName == info[i].Name)    
                           {
                         Debug.Log (info[i].Name);
                         }
                     }
                 }
             }
         }
         
         foreach(FileInfo f in info)
         {
 //            Debug.Log(f.Name);
         }
             
     }
 }
 

Any help would be appreciated Thanks AR