Why when coloring in script some objects it's coloring all the objects ?

Code (csharp):

1.  
2. for (int i = 0; i <  listfoundobj.Count; i++)
3.         {
4.             listfoundobj[i].GetComponent<Renderer>().sharedMaterial.color = Color.green;
5.         }
6.  

listfoundobj contain 4 items.

And i have a grid of objects size 10x10 and it keep coloring the whole grid the whole 100 objects but i want it to color only this 4 objects.

 

you are using sharedmaterial

https://docs.unity3d.com/ScriptReference/Renderer-sharedMaterial.html

 

Now it's coloring them using only material. But also give me exception:

Code (csharp):

1.  
2. listfoundobj[i].GetComponent<Renderer>().material.color = Color.green;
3.  

Instantiating material due to calling renderer.material during edit mode. This will leak materials into the scene. You most likely want to use renderer.sharedMaterial instead.