returning fields

I am writing a method where a screen pops up and need to select two of the three fields to run a customer search(acct, name, ssn). Right now when I run the search it checks for the bill account and only one of the other fields. Can someone show me how to change this to any of the three fields instead of just bill account and one of the other fields. Let me know if you have additional questions I need to have answered as I am only sending the method...

Code:

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        private Message GetSadData(string acct, string inputSsn, string inputAcctName, string inputState,
                                    out string ssn, out string firstName, out string lastName, out string fullName)
        {
            ssn = string.Empty;
            firstName = string.Empty;
            lastName = string.Empty;
            fullName = string.Empty;

            Message message = new Message();
            message.Description = new List<string>();
            string errTxt = string.Empty;
            long billAcct = 0;
            long cssSsn = 0;

            //Kruep code changes
            if (billAcct != null && billAcct > 0)
            {
                if (!long.TryParse(acct, out billAcct))
                {
                    message.Code = MessageStatusCodes.Error;
                    message.Description.Add(errTxt = "The account provided was not in the correct format.");
                    return message;
                }

                if (!EAPortalOracleManager.AccountExists(billAcct.ToString()))
                {
                    message.Code = MessageStatusCodes.Error;
                    message.Description.Add(errTxt = "No client data found matching the entered criteria.");
                    return message;
                }
            }


            //Need to change the check to be at least 2 of the inputs are populated
            if ((inputAcctName == null || inputAcctName == "") || (billAcct != null && billAcct > 0)  && !long.TryParse(inputSsn, out cssSsn))
            {
                message.Code = MessageStatusCodes.Error;
                message.Description.Add(errTxt = "The SSN provided was not in the correct format.");
                return message;
            }

            if ((inputAcctName == null || inputAcctName == "") && (billAcct != null && billAcct > 0 || !long.TryParse(inputSsn, out cssSsn))
            {
                    message.Code = MessageStatusCodes.Error;
                    message.Description.Add(errTxt = "The account name provided does not match CSS.");
                    return message;
            }

            Message oracleSadMessage = new Message();
           
            oracleSadMessage = EAPortalOracleManager.GetSADData(acct, out ssn, out firstName, out lastName, out fullName);
            if (oracleSadMessage.Code == MessageStatusCodes.Error)
            {
                message.Code = MessageStatusCodes.Error;
                message.Description.Add(errTxt = "Error accessing data for account " + acct + ".");
            }



            if ((acct != null || inputAcctName != null && inputAcctName.Length > 1) && (cssSsn >= 1))
            {
                if (string.IsNullOrEmpty(ssn) || cssSsn != Convert.ToInt64(ssn))
                {
                    message.Code = MessageStatusCodes.Error;
                    message.Description.Add(errTxt = "The SSN provided does not match the records in CSS.");
                    return message;
                }
            }
            else if ((inputAcctName != null && inputAcctName.Length > 1) && (acct != null || cssSsn >= 1))
            { 
                string firLast = firstName.ToUpper() + " " + lastName.ToUpper();
                string last = lastName.ToUpper();

                if (inputAcctName.ToUpper() != firLast && inputAcctName.ToUpper() != lastName)
                {
                    message.Code = MessageStatusCodes.Error;
                    message.Description.Add(errTxt = "The account name provided does not match CSS.");
                    return message;
                }
            }
            else if ((acct != null) && (inputAcctName != null && inputAcctName.Length > 1) || (cssSsn >= 1))
            {
                if (string.IsNullOrEmpty(acct))
                {
                    message.Code = MessageStatusCodes.Error;
                    message.Description.Add(errTxt = "No client data found matching the entered criteria.");
                    return message;
                }
            }

            if (inputState != "IL" && inputState != "MO")
            {
                message.Code = MessageStatusCodes.Error;
                message.Description.Add(errTxt = "Please provide a valid state.");
                return message;
            }
            return message;
        }

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Create a Boolean Flag, set it to True at the top (after //Need to...)
Then, in each IF/Then, if it fails, set it to FALSE.
After 3 searches, check the Flag, and then output the message