Fetch the value of Datafield

Here is an example from the K2 online help:

Developer Reference > Processes > Accessing > How to retrieve data fields

 
using System;
using System.Collections.Generic;
using System.Text;
using SourceCode.Hosting.Client;
using SourceCode.Workflow.Client;
 
namespace K2Samples
{
    class WorkflowAccessingSample
    {
        public void RetrieveDataFields()
        {
            // TODO: Replace these placeholder values with values for your environment
            string _serverName = "blackpearl";
            string _user = "K2Student";
            string _domain = "DENALLIX";
            string _password = "K2pass!";
            string _wfSerialNumber = "4_12";
 
            SourceCode.Hosting.Client.BaseAPI.SCConnectionStringBuilder connectionString =
                new SourceCode.Hosting.Client.BaseAPI.SCConnectionStringBuilder();
 
            connectionString.Authenticate = true;
            connectionString.Host = "localhost";
            connectionString.Integrated = true;
            connectionString.IsPrimaryLogin = true;
            connectionString.Port = 5252;
            connectionString.UserID = _user;
            connectionString.WindowsDomain = _domain;
            connectionString.Password = _password;
            connectionString.SecurityLabelName = "K2"; //the default label
 
            // open a K2 connection
            Connection connection = new Connection();
            connection.Open(_serverName, connectionString.ToString());
 
            try
            {
                // loop through each worklist item
                foreach (WorklistItem worklistItem in connection.OpenWorklist())
                {
                    // open the worklist item
                    worklistItem.Open();
 
                    // match with the workflow serial number
                    if (worklistItem != null && worklistItem.SerialNumber == _wfSerialNumber)
                    {
                        // loop through each data field and write the name and value to the console
                        foreach (DataField dataField in worklistItem.ProcessInstance.DataFields)
                        {
                            Console.WriteLine(dataField.Name + ": " + dataField.Value);
                            Console.ReadLine();
                        }
                    }
                }
               
            }
            catch (Exception ex)
            {
                // write error to console
                Console.WriteLine("Error: " + ex.Message);
                Console.ReadLine();
            }
 
            finally
            {
                // close the connection
                connection.Close();
            }
        }
    }
}

I modified a section of the sample so that it will only return a specific process datafield value for a specific worklist item. 

if (worklistItem != null && worklistItem.SerialNumber == _wfSerialNumber)
{
       Console.WriteLine(worklistItem.ProcessInstance.DataFields["Name of my Process Datafield"].Value);
}

The sample I posted comes with the help that ships directly with K2 software and is installed by default with the client tools (I guess I shouldn't have said online help although the k2 blackpearl documentation is also available at help.k2.com).  From the Start/All Programs/K2 blackpearl select K2 blackpearl Documentation you can follow the topic sections to find the code sample I provided and many more.