How to add values to the existing keys in the dictionary in C#

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C#

ASP.NET

collections

dictionary

I Have the following code which returns me 7 records collection in the dictionary<int,nonexuscounterparty> format. NoNexusCounterparty is a class in which 17 properties defined. Each record have int as a key and class object as a value. classObject value have 17 parameters. Out of which I am setting the 8 parameters values in first for each loop in below code which is working fine.

[AcceptVerbs(HttpVerbs.Get)]
public ContentResult GetAllNexusFavs()
{
    string refreshTimestamp = _utilityProvider.GetCclDatabaseTimeStamp();
    //List<NoNexusCounterparty> cps = new List<NoNexusCounterparty>();
    
    CounterpartyQuery query = this.CreateCounterpartyQuery();

    _log.InfoFormat("GetAllNexusFavs start " + query.ToString());

    CounterpartyResponse cpResponse = new CounterpartyResponse();
    CounterpartyResponse cpASICResponse = new CounterpartyResponse();
    CounterpartyResponse cpMASResponse = new CounterpartyResponse();
    CounterpartyResponse cpHKGResponse = new CounterpartyResponse();

    Dictionary<int, NoNexusCounterparty> noNexusCpsdict = new Dictionary<int, NoNexusCounterparty>();

    if (query.beId != "-1")
    {
        cpResponse = _counterpartyProvider.GetFavorites(query);//no cross border
    }

    foreach (var counterparty in cpResponse.counterpartyList)
    {
        NoNexusCounterparty cps = new NoNexusCounterparty();
        cps.NoNexuseligibleInd = counterparty.EligibleInd;
        cps.NoNexuseligibleInd = counterparty.EligibleInd;
        cps.NonSEFNoNexusEligibleInd = counterparty.NonSEFEligibleInd;
        cps.SEFNoNexusEligibleInd = counterparty.SEFEligibleInd;
        cps.CounterpartyId = counterparty.CounterpartyId;
        cps.CounterpartyName = counterparty.CounterpartyName;
        cps.BuyingCentreId = counterparty.CounterpartyId;
        cps.BuyingCentreName = counterparty.BuyingCentreName;
        cps.cftcDis = counterparty.cftcDis;
        noNexusCpsdict.Add(cps.CounterpartyId, cps);
    }

Now I want to set the remaining 9 parameters values using other foreach loop which I am trying with below code below.

List<KeyValuePair<int, NoNexusCounterparty>> listcps = noNexusCpsdict.ToList();
query.IsNexusASICInScope = 1;

cpASICResponse = _counterpartyProvider.GetFavorites(query);

foreach (KeyValuePair<int,NoNexusCounterparty> pair in listcps )
{
    foreach (var counterparty in cpResponse.counterpartyList)
    {
        cps.SEFASICEligibleInd = counterparty.SecEligibleInd;
        cps.NonSEFASICEligibleInd = counterparty.NonSEFEligibleInd;
        cps.ASICeligibleInd = counterparty.EligibleInd;
        noNexusCpsdict.Add(cps.CounterpartyId, cps);
    }
}

But it is throwing an error as An item with the same key has already been added.
How I can use the same dictionary object retrn in the first for each loop and its keys to set the other 9 parameters against the each key.

What I have tried:

List<keyvaluepair><int,>> listcps = noNexusCpsdict.ToList();
query.IsNexusASICInScope = 1;

cpASICResponse = _counterpartyProvider.GetFavorites(query);

foreach (KeyValuePair<int,nonexuscounterparty> pair in listcps )
{
    foreach (var counterparty in cpResponse.counterpartyList)
    {
        NoNexusCounterparty cps = new NoNexusCounterparty();
        cps.SEFASICEligibleInd = counterparty.SecEligibleInd;
        cps.NonSEFASICEligibleInd = counterparty.NonSEFEligibleInd;
        cps.ASICeligibleInd = counterparty.EligibleInd;
        noNexusCpsdict.Add(cps.CounterpartyId, cps);
    }
}