Visitor pattern

Code:

class MutualFundOrderProvider
{
 private Dictionary<string,string> GetKeyValues(MutualFundOrderInfo info)
 {
  ...
 }
}

class GICOrderProvider
{
 private Dictionary<string,string> GetKeyValues(GICOrderInfo info)
 {
  ...
 }
}

class EquityOrderProvider
{
 private Dictionary<string,string> GetKeyValues(EquityOrderInfo info)
 {
  ...
 }
}

//visitor approach
//Create interface
interface IKeyValueComputer
{
 Dictionary<string,string> GetKeyValues(EquityOrderInfo info);
 Dictionary<string,string> GetKeyValues(GICOrderInfo info);
 Dictionary<string,string> GetKeyValues(MutualFundOrderInfo info)
}

//implementation
class KeyValueComputer:IKeyValueComputer
{
 //all implementations...
}

//another interface
interface IComputeKeyValues
{
 Dictionary<string,string> ComputeKeyValues(IKeyValueComputer keyvalcomp)
}

class EquityOrderInfo: IComputeKeyValues
{
 public Dictionary<string,string> ComputeKeyValues(IKeyValueComputer keyvalcomp)
 {
  return keyvalcomp.GetKeyValues(this);
 }
}

//MutualFundOrderProvider
class MutualFundOrderProvider
{
 public void Translate(MutualFundOrderInfo info)
 {
  IKeyValueComputer keyvalcomp=new KeyValueComputer();
  info.ComputeKeyValues(keyvalcomp);
 }
}