How to compare list item to a gameobject name in C#

Hello, i'm trying to deactivate gameobject inside my GUI based on their name by comparing a list of element from an external text file to an array of GameObject. It's working when i'm hard-coding the value of the string but otherwise it's not working even though the value is good.

i can't copy paste whole code, but i'll try to put the related line

 GameObject[] myColorSwatch; //i first declare my game object array
 String tempcolor = ""; //create a var that will temporarely store TXT file content.

 void Start()
 {
     myColorSwatch = GameObject.FindGameObjectsWithTag("UI_Colorswatch"); //i populate the array on start
 }
 void HighlightText() //i create a function that is called on a mouseover even on a GUI button
         colorSourceFile = new FileInfo("./Assets/TXT/" + currentHighlightName + "c.txt"); //I declaire a text file based on button name, the text file contain 3 lines, each containing 9 number that represent a certain color RGB value, first line is 000000000
         readerColor = colorSourceFile.OpenText(); //i read the text in the text file
         tempcolor = readerColor.ReadToEnd();//store all the text in a variable
         templistcolor = tempcolor.Split('\n').ToList();//separate each line of text into separate list item
         Debug.Log("this is my tempcolor value: " + tempcolor); //return the 3 line of text
         Debug.Log("this is my templistcolor value: " + templistcolor[2]);//return the third line of text
         readerColor.Close(); //closing the reader
         //--//
         Debug.Log("this is my templistcolor number " + templistcolor[0]); //return 000000000
         string tempcolorname = "Button-"+ templistcolor[0].ToString(); //return Button-000000000
         string tempcolornumber = templistcolor[0].ToString(); //return 000000000
         string temptestcolor = "Button-"+templistcolor[0]; //return Button-000000000
         Debug.Log("this is my tempcolornumber number " + tempcolornumber);//return 000000000
         string hardcodename = "000000000";
         
         foreach (GameObject _obj in myColorSwatch)
         {
             if (_obj.name != "Button-"+tempcolornumber) //this IF statement only work if I use _obj.name == "Button-"+hardcodename) no other option work. Of course i dont want to hardcode the value...
             {
                 Debug.Log("doing the IF");
                 _obj.SetActive(false);//i want to turn every game object off but the color that exist in my text file. work when hardcoding the value in the IF statement.
             }

         }