Courses/AddCourse.aspx.cs

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)

namespace IndiaStudyChannel.Courses
{
	/// <summary>
	/// Summary description for AddCourse.
	/// </summary>
	public partial class AddCourse : System.Web.UI.Page
	{
	
		protected void Page_Load(object sender, System.EventArgs e)
		{
            this.Page.Form.DefaultFocus = txtCourseName.ClientID;

			if ( Page.IsPostBack )
				return;

			// Make sure user has logged in before can post a university.

			if ( Session["CurrentUser"] == null )
			{
				// User has not logged in. Redirect to login page and pass current URL as a query string
				// so that after login, we can redirect user back to this page again.
				Response.Redirect("../Members/Login.aspx?ReturnUrl=" + Request.Url.PathAndQuery);
			}

			// Load the list of Course Categories in the drop down.
			LoadCourseCategories();

			string courseId = Request.QueryString["Id"];
			if ( courseId == null )
			{
				// No course id is passed in query string. So we are here to add a new course.
			}
			else
			{
				// Course Id is passed as query string. So we are here to edit a course.

				// Pre populate the course by the id.
				LoadCourseDetails( int.Parse(courseId) );
			}			
		}

		/// <summary>
		/// This method reads the details of the selected course and displays in the UI.
		/// </summary>
		/// <param name="courseId"></param>
		private void LoadCourseDetails( int courseId )
		{