gistfile1.cs

class Person
{
    public string Name { get; set; }
}

class ViewModel
{
    public Person Person;
}

class Program
{
    static void Main(string[] args)
    {
        var viewModel = new ViewModel
        {
            Person = new Person
            {
                Name = "Rohan"
            }
        };

        var selector = Make("Person.Name").Compile();

        Console.WriteLine(selector.Invoke(viewModel));
    }

    static Expression<Func<object, object>> Make(string path)
    {
        var pathParts = path.Split('.');

        Func<object, object> func = viewModel =>
        {
            var current = viewModel;

            foreach (var property in pathParts)
            {
                var currentType = current.GetType();

                var propertyInfo = currentType.GetProperty(property);
                if (propertyInfo != null)
                {
                    current = propertyInfo.GetValue(current);
                    continue;
                }

                var fieldInfo = currentType.GetField(property);
                if (fieldInfo != null)
                {
                    current = fieldInfo.GetValue(current);
                    continue;
                }

                throw new Exception();
            }

            return current;
        };

        var viewModelParam = Expression.Parameter(typeof(object));

        var callParams = new Expression[]
        {
            viewModelParam
        };

        var funcInstance = Expression.Constant(func.Target);
        var callExpr = Expression.Call(funcInstance, func.Method, callParams);

        return Expression.Lambda<Func<object, object>>(callExpr, viewModelParam);
    }
}