c# - How to clean up if else series

Question

Work in C#, want to reduce if else series, entity have two property FromServiceID and ToServiceID ,suppose my ServiceClass instance have bellow information.How to clean up bellow code? any type of suggestion will be acceptable.

entity= new ServiceClass();
entity.FromServiceID=3
entity.ToServiceID=1

if (entity.FromServiceID == 1)
{
    entity.1KWithdrawal();
}
else if (entity.FromServiceID == 2)
{
    entity.10KWithdrawal();
}
else if (entity.FromServiceID == 3)
{
    entity.BTWithdrawal();
}           
if (entity.ToServiceID == 1)
{
    entity.1KDeposit();
}
else if (entity.ToServiceID == 2)
{
    entity.10KDeposit();
}
else if (entity.ToServiceID == 3)
{
    entity.BTDeposit();
}


public class ServiceClass
{ 

    public int FromServiceID { get; set; }
    public int ToServiceID { get; set; }

    public void 1KWithdrawal()
    { Console.WriteLine("One_KWithdrawal"); }

    public void 10KWithdrawal()
    { Console.WriteLine("Ten_KWithdrawal"); }

    public void BTWithdrawal()
    { Console.WriteLine("BTWithdrawal"); }

    public void 1KDeposit()
    { Console.WriteLine("One_KDeposit"); }

    public void 10KDeposit()
    { Console.WriteLine("Ten_KDeposit"); }

    public void BTDeposit()
    { Console.WriteLine("Ten_KDeposit"); }
}

Answer 1

Use a Dictionary. Something like this:

Dictionary<int, ServiceClass> dictionary = new Dictionary<int, ServiceClass>()
{
    {1,  new ServiceClass()},
    {2,  new ServiceClass()},
    {3,  new BTWithdrawal()},//assume BTWithdrawal inherits from ServiceClass
};

An example of how using it:

ServiceClass value=new ServiceClass();
value.FromServiceId=1;
value.ToServiceId = 2;
dictionary.TryGetValue(value.FromServiceId, out value);
//or dictionary.TryGetValue(value.ToServiceId, out value);
if (value != null) MessageBox.Show(value.Id.ToString());