Creating kanban with button click

Hey to give a run down of what im trying to achieve is on launch of my WPF application I have it so you can create a project. Options include project name, project description ect. Kanban control is the best to show case the projects but my issue is I cant get it to create one off a button click. Code is provided below of how I tried to Achieve this and any help is appreciated

public class TaskDetails   {          public TaskDetails()          {              Tasks = new ObservableCollection<KanbanModel>();                 KanbanModel task = new KanbanModel();              task.Title = "test";              task.ID = "1";              task.Description = "Project Name -";              task.Category = "Project";              task.ColorKey = "High";              task.Tags = new string[] { "BO2", "MP" };              Tasks.Add(task);          }             public ObservableCollection<KanbanModel> Tasks { get; set; }             public void CreateTask(string title, string id, string desc, string category, string color, string[] tags)          {              KanbanModel task = new KanbanModel();              task.Title = title;              task.ID = id;              task.Description = desc;              task.Category = category;              task.ColorKey = color;              task.Tags = tags;              Tasks.Add(task);          }      }

public partial class MainWindow : Window  {          public MainWindow()          {              InitializeComponent();          }             private void CreateprojectButton_Click(object sender, RoutedEventArgs e)          {              MessageBox.Show("test");              taskDetails.CreateTask("test1", "3", "Description", "Project", "High", new string[] { "BO2", "MP" });          }   }