using System;

​

public class Program

{

    public static void Main()

    {

        var sample1 = new MyClass{Id = (decimal)0};

        var sample2 = new MyClass{Id = (int)0};

        var sample3 = new MyClass{Id = (byte)0};

        var property = typeof (MyClass).GetProperty(nameof(MyClass.Id));

        property.SetValue(sample1, Convert.ChangeType((decimal)10, property.PropertyType));

        property.SetValue(sample2, Convert.ChangeType((int)10, property.PropertyType));

        property.SetValue(sample3, Convert.ChangeType((byte)10, property.PropertyType));

        Console.WriteLine(sample1.Id);

        Console.WriteLine(sample2.Id);

        Console.WriteLine(sample3.Id);

    }

}

​

public class MyClass

{

    public decimal Id

    {

        get;

        set;

    }

}