How to get Comment value

Hi Ashok

I attached below method in Pre Event of workflow transition and able to get the comment provided by user. Changes to be done are highlighted below

Innovator inn = this.getInnovator();
Aras.Server.Security.Identity plmIdentity = Aras.Server.Security.Identity.GetByName("Super User");
bool permissionWasSet = false;
try
{
permissionWasSet = Aras.Server.Security.Permissions.GrantIdentity(plmIdentity);
Item wf = inn.newItem ("Workflow","get");
Item wfp = inn.newItem("Workflow Process","get");
Item wfpa = inn.newItem("Workflow Process Activity","get");
Item act = inn.newItem("Activity","get");
act.setID(this.getID());
wf.setRelatedItem(wfp);
wfp.addRelationship(wfpa);
wfpa.setRelatedItem(act);
wf = wf.apply();
if( 1 != wf.getItemCount())
{
wf = wf.getItemByIndex(0);
}
Item parentItem = this.newItem("ItemTypeName", "get");
parentItem.setID(wf.getProperty("source_id"));
parentItem = parentItem.apply();

string userID = inn.getUserID();
Item workflow = inn.newItem("Workflow", "get");
workflow.setProperty("source_id",parentItem.getID());
Item workflowProcess = inn.newItem("Workflow Process", "get");
Item workflowProcessActivity = inn.newItem("Workflow Process Activity", "get");
Item activity = inn.newItem("Activity", "get");
activity.setProperty("closed_by","");
activity.setPropertyCondition("closed_by","is not null");
Item activityAssign = inn.newItem("Activity Assignment", "get");
activityAssign.setProperty("closed_by",userID);
activity.addRelationship(activityAssign);
workflowProcessActivity.setRelatedItem(activity);
workflowProcess.addRelationship(workflowProcessActivity);
workflow.setRelatedItem(workflowProcess);
workflow = workflow.apply();

Item activityAssignment = workflow.getItemsByXPath("//Item[@type='Activity Assignment']");
if( activityAssignment.getItemCount() == 0 )
{
return inn.newError("No Closed Activity");
}
string comments = activityAssignment.getItemByIndex(0).getProperty("comments");
return inn.newError(comments);  //Can be removed. Added for testing Purpose
return this;
}
catch(Exception ex)
{
return inn.newError(ex.Message);
}
finally
{
if(permissionWasSet)
{
Aras.Server.Security.Permissions.RevokeIdentity(plmIdentity);
}
}

Thank You

Gopikrishnan R