Switching between two blend trees,How do I change Entry to other blend tree

Hi, I need help with swithing blend trees. I have two character movments animation in 2D top down pixelate game and they are same just one thing is different in one blend tree are shadows and in other blend tree are not shadows and I need c# script for changing between this two blend trees on button click can someone please help me?,Hi, I need help with swithing blend trees. I have two character movments animation in 2D top down pixelate game and they are same just one thing is different in one blend tree are shadows and in other blend tree are not shadows and I need script for changing between this two blend trees on button click can someone please help me?