protected void btnNewTask_Click(object sender, EventArgs e)
 {
     lblError.Text = "";
     if (currentProject != null && txtNewTask.Text != "")
     {
         Tasks newTask = new Tasks();
         newTask.name = txtNewTask.Text;
         newTask.addToProject(currentProject.id);
         newTask.save();
         txtNewTask.Text = "";
         //liste neu laden
         updateTasks();
     }
     else lblError.Text = "Task kann nicht gespeichert werden!";
 }