These gists are part of the article: https://blog.georgekosmidis.net/2020/08/07/early-vs-late-binding-reflection-and-type-dynamic-in-csharp/

EarlyBindingSample.cs

public class EarlyBindingSample 
{
	public void RandomMethod()
	{
		//...
	}
}

var earlyBinding = new EarlyBindingSample();

/***Existing method***/
//This is early binding, the method is found during compile time
earlyBinding.RandomMethod(); 

/***Non-Existing method***/
//Method 'NotExistingMethod' does't exist:
earlyBinding.NotExistingMethod(); 
//Compiler Error CS1061:
// 'EarlyBindingSample' does not contain a definition for 'NotExistingMethod' 
//   and no accessible extension method 'NotExistingMethod' 
//   accepting a first argument of type 'EarlyBindingSample' could be found 
//   (are you missing a using directive or an assembly reference?)

LateBindSample_Activator.cs

public interface ILateBoundSample
{
	void RandomMethod();
}

//Load an assembly
var assembly = Assembly.LoadFile(Path.GetFullPath("path_to_your_assembly"));

//Locate all types that implement interface 'ILateBoundSample'
var types = assembly.GetTypes().Where(p => typeof(ILateBoundSample).IsAssignableFrom(p));
if (types.Any())
{
	/***Existing method***/
	//Create an instance of that class
	var lateBoundSample = (ILateBoundSample)Activator.CreateInstance(types.First());
	
	//Locate and call method RandomMethod();
	lateBoundSample.RandomMethod();
	
	/***Non-Existing method***/
	//Method 'NotExistingMethod' does't exist
	// Since 'lateBoundSample' is of type 'ILateBoundSample', compiler knows
	lateBoundSample.NotExistingMethod(); 
	//Compiler Error CS1061:
	// 'ILateBoundSample' does not contain a definition for 'NotExistingMethod' 
	//   and no accessible extension method 'NotExistingMethod' 
	//   accepting a first argument of type 'ILateBoundSample' could be found 
	//   (are you missing a using directive or an assembly reference?)
}

LateBindSample_Invoke.cs

public class LateBindingSample 
{
	public void RandomMethod()
	{
		//...
	}
}

var lateBoundSample = new LateBindingSample();

/***Existing method***/
//Locate method 'NotExistingMethod' that doesn't exist
var method = lateBoundSample.GetType().GetMethod("RandomMethod");

//Call method without any parameteres (null)
var result = method.Invoke(lateBoundSample, null);

/***Non-Existing method***/
//Try to locate method 'RandomMethod'
var method = lateBoundSample.GetType().GetMethod("NotExistingMethod");

//Call method without any parameteres (null)
var result = method.Invoke(lateBoundSample, null);
// You 'll get a runtime error since 'method' is null:
// System.NullReferenceException: 'Object reference not set to an instance of an object.