Expression Tree Tutorial Getter/Setter Expression

public class Employee
{
    public string Name { get; set; }
    public DateTime BirthDate { get; set; }
}

public static class ExpressionUtils
{
    public static Action<TEntity, TProperty> CreateSetter<TEntity, TProperty>(string name) where TEntity: class
    {
        PropertyInfo propertyInfo = typeof(TEntity).GetProperty(name);

        ParameterExpression instance = Expression.Parameter(typeof(TEntity), "instance");
        ParameterExpression propertyValue = Expression.Parameter(typeof(TProperty), "propertyValue");

	var body = Expression.Assign(Expression.Property(instance, name), propertyValue);

        return Expression.Lambda<Action<TEntity, TProperty>>(body, instance, propertyValue).Compile();
    }

    public static Func<TEntity, TProperty> CreateGetter<TEntity, TProperty>(string name) where TEntity: class
    {
        ParameterExpression instance = Expression.Parameter(typeof(TEntity), "instance");

        var body = Expression.Property(instance, name);

        return Expression.Lambda<Func<TEntity, TProperty>>(body, instance).Compile();
    }
}

var setterNameProperty = ExpressionUtils.CreateSetter<Employee, string>("Name");
var setterBirthDateProperty = ExpressionUtils.CreateSetter<Employee, DateTime>("BirthDate");

Employee emp = new Employee();

setterNameProperty(emp, "John");
setterBirthDateProperty(emp, new DateTime(1990, 6, 5));

Console.WriteLine("Name: {0}, DOB: {1}", emp.Name, emp.BirthDate);

var getterNameProperty = ExpressionUtils.CreateGetter<Employee, string>("Name");
var getterBirthDateProperty = ExpressionUtils.CreateGetter<Employee, DateTime>("BirthDate");

Employee emp1 = new Employee()
{
    Name = "John",
    BirthDate = new DateTime(1990, 6, 5)
};

var name = getterNameProperty(emp1);
var birthDate = getterBirthDateProperty(emp1);

Console.WriteLine("Name: {0}, DOB: {1}", name, birthDate);