How to load several assembly in c # and invoke them

How can I load several assembly and use them? Since when I charge one by means of:

var assemblyBytes = File.ReadAllBytes("ReflectionAssemblyLoadTarget.exe");
var loadMethod = typeof(Assembly).GetMethod("Load", new Type[] { typeof(byte[]) });
var newAssembly = loadMethod.Invoke(null, new object[] { assemblyBytes });

((Assembly)newAssembly).EntryPoint.Invoke(null, new object[] { args });

I charge and call but when I charge several for example:

//Load the bytes as an assembly
Assembly exeAssembly = Assembly.Load(bytes1);

//Execute the assembly
object[] parameters = new object[1];                //Don't know 
 exeAssembly.EntryPoint.Invoke(null, parameters);

//Load the bytes as an assembly
Assembly exeAssembl = Assembly.Load(bytes2);

//Execute the assembly
object[] parameter = new object[1];                //Don't know 
 exeAssembl.EntryPoint.Invoke(null, parameter);

Only the first one invokes me but the others do not. Why? What is this about? Can only one assembly be used per program is that why?