How to assign a texture from the database to a material?

Question

C++ / C#

It seems to be written correctly, but does not insert
Texture2D treat = AssetDatabase.LoadAssetAtPath("Assets/Materials/Materials/Video/Covers/screenShot"+ numberCapture +".jpg", typeof(Texture2D)) as Texture2D;
_material.SetTexture("_MainTex", treat);

Answer 1

pastebin.com/EbnYvXYg
Refresh on both sides of the asset loading saved)