Lucy's blog

Assigning a (workflow)task to a Group from code can be tricky, but this trick works:

SPGroup group = SPWeb.UserGroups[“groupname”];
SPFieldUserValue groupvalue = new SPFIeldUserValue(                  group.ParentWeb, group.ID, group.Name);
SPWorkflowTaskProperties taskProperties = new SPWorkflowTaskProperties();
 (Connect these taskproperties to the task to update)

taskProperties.AssignedTo = groupvalue.LookupValue;

To display these tasks in the task list the view 'Groups' has to be selected. they will not shop up in the 'My Tasks' view.