Web/StudentCourse/Add.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Text;
using Maticsoft.Common;

namespace StudentExamination.Web.StudentCourse
{
    public partial class Add : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                int StudentID = int.Parse(Session["UserId"].ToString());
                Model.Subject subject = new Model.Subject();
                lbSubject.DataSource = subject.GetStudentSubject(StudentID);
                lbSubject.DataTextField = "subjectTitle";
                lbSubject.DataValueField = "subjectID";
                lbSubject.DataBind();
            }
                       
        }

        		protected void btnSave_Click(object sender, EventArgs e)
		{
			
			string strErr="";
            if (lbSubject.SelectedValue == "")			
			{
				strErr+="科目不能为空！\\n";	
			}

            if (!PageValidate.IsNumber(lbSubject.SelectedValue))
			{
                strErr += "科目ID格式错误！\\n";	
			}

			if(strErr!="")
			{
				MessageBox.Show(this,strErr);
				return;
			}
            int SubjectID = int.Parse(lbSubject.SelectedValue);
            string SubjectName = lbSubject.Items[lbSubject.SelectedIndex].ToString();
			int StudentId = int.Parse(Session["UserId"].ToString());

			Model.StudentCourse model=new Model.StudentCourse();
            bool hasSelect = model.hasSelect(SubjectID, StudentId);
            if (hasSelect)
            {
                MessageBox.Show(this, SubjectName + "已经选课，请选择科目");
                return;