You can get the task this way:
private void OnKanbanChange(Event ev)

KanbanChangeEventDetail detail = ev[“Detail”];

var oldValue = detail.OldValue;
var value = detail.Value;

KanbanDataRecord record = new KanbanDataRecord();
record.Text = value.text;
record.Status = value.status;
record.Priority = value.priority;

string task = detail.Task.ToString();
string valueToString = detail.Value.ToString();


When you have the new properties, you can modify the record in the database.
I hope this helps!