A Task Management System using Three Layer Architecture

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for TaskBLL
/// </summary>
public class TaskBLL
{
	public TaskBLL()
	{
		//
		// TODO: Add constructor logic here
		//
	}
    public string AddNewTask(string taskId, string taskName, string taskProjectId, string taskDescription, string taskCreationDate, string taskEndDate, string taskStatus)
    {
        Task taskObj = new Task();
        taskObj.TaskId = taskId;
        taskObj.TaskName = taskName;
        taskObj.Task_ProjectId = taskProjectId;
        taskObj.TaskDescription = taskDescription;
        taskObj.TaskStartDate = taskCreationDate;
        taskObj.TaskEstimatedEndDate = taskEndDate;
        taskObj.TaskStatus = taskStatus;
        TaskGateWay taskGateWayObj = new TaskGateWay();
        return taskGateWayObj.InsertNewTask(taskObj);
    }
    public bool AddUserToTask(string taskId, string projectId, string userId, string userStartDate, string userEndDate)
    {
        TaskDetails taskDetailsObj = new TaskDetails();
        taskDetailsObj.TaskId = taskId;
        taskDetailsObj.ProjectId = projectId;
        taskDetailsObj.UserId = userId;
        taskDetailsObj.UserStartDate = userStartDate;
        taskDetailsObj.UserEndDate = userEndDate;
        TaskGateWay taskGateWayObj = new TaskGateWay();
        return taskGateWayObj.InserUserToTask(taskDetailsObj);
    }
    public DataTable SelectTaskInformationOfUser(string userId)
    {
        TaskGateWay taskGateWayObj = new TaskGateWay();
        return taskGateWayObj.SelectTaskOfOwnerUser(userId);
    }
    public DataTable SelectTaskInformation(string taskId)
    {
        TaskGateWay taskGateWayObj = new TaskGateWay();
        return taskGateWayObj.SelectAllTaskData(taskId);
    }
    public void ForwardTask(string taskId, string userId)
    {
        TaskGateWay taskGateWayObj = new TaskGateWay();
        taskGateWayObj.ForwardTask(taskId, userId);

    }
}