title: Cannot add new Workitems using TFS API
body: <p>Hi I am trying to add new workitems to the TFS repository using the API, but when I validate the workitem before it is saved, it returns an error. I previously got exceptions regarding the field definitions for a bug namely, Symptom, Steps to Reproduce and Triage. (Error code TF 26027). The code snippet is shown below: Can anyone tell me what's wrong here?</p>
  
  <pre><code>switch (workItemType)
          {
              case "Bug":
                  {
                      workItem.Title = values["Title"].ToString();
                      workItem.State = values["State"].ToString();
                      workItem.Reason = values["Reason"].ToString();
                      workItem.Fields["Priority"].Value = values["Priority"].ToString();
                      workItem.Fields["Severity"].Value = values["Severity"].ToString();
                      //workItem.Fields["Triage"].Value = values["Triage"].ToString();
                      workItem.Fields["Assigned To"].Value = values["Assigned To"].ToString();
                      //workItem.Fields["Symptom"].Value = values["Symptom"].ToString();
                      //workItem.Fields["Steps to Reproduce"].Value = values["Steps to Reproduce"].ToString();
  
                      // Validate the Work Item fields.
                      ArrayList result = workItem.Validate();
                      // If any invalid fields are returned, report an error.
                      if (result.Count &gt; 0)
                          MessageBox.Show("An Error occurred while adding the Bug to the repository.");
                      else
                          workItem.Save();
                  }
                  break;
  </code></pre>