MVC :: Index Showing A Records Or Multiple Table / Edit That Record?

i have edit problem...still i giving u a code of index that showing a records or multiple table how can i edit that record?

TaskManagerDataContext _Context = new TaskManagerDataContext();
[Authorize]
public ActionResult Index()
{
var userId = Guid.Parse(Membership.GetUser().ProviderUserKey.ToString());
TaskRepository getTask = new TaskRepository();
var taskInfo = getTask.GetByUser(userId).ToList();
return View(taskInfo);
}
// Class TaskRepositor
public List<TaskDetailModel> GetByUser(Guid userId)
{
var getTask = from taskData in _Context.Tasks
join projectData in _Context.Projects on taskData.ProjectId equals projectData.ProjectId
join typeData in _Context.TaskTypes on taskData.TaskTypeId equals typeData.TaskTypeId
join statusData in _Context.Status on taskData.StatusId equals statusData.StatusId
where taskData.UserId == userId
select TaskDetailModel.CreateModel(taskData.TaskId, projectData.ProjectName, taskData.TaskName, typeData.TaskType1, statusData.Status1);
return getTask.ToList();
}
//Class TaskDetail Model
public class TaskDetailModel
{
public static TaskDetailModel CreateModel(int id,string project, string desc, string taskType, string status)
{
return new TaskDetailModel
{
Id = id,
Description = desc,
Project = project,
Type = taskType,
Status = status,
Date = System.DateTime.Now.ToString()
};
}
public int Id { set; get; }
public string Description { set; get; }
public string Project { set; get; }
public string Type { set; get; }
public string Status { set; get; }
public string Date { set; get; }
}