Backup/XDF/Student/StudentDefault.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;

namespace XDF.Student
{
    public partial class StudentDefault : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack == false)
            {
                if (Session["UserRole"] == null)
                    Response.Redirect("~/Login.aspx");

                string userid = Session["UserID"].ToString();
                string username = getUserName(userid);
                LabelUserName.Text = username;
            }
        }
        private string getUserName(string stuid)
        {
            string result = "";
            try
            {
                // 1. 创建连接
                SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["XDF"].ConnectionString);

                // 2. 打开连接
                connection.Open();

                // 2.1 创建命令对象
                SqlCommand command = null;

                command = new SqlCommand("select StuName from Student where StuID=@StuID", connection);
                command.Parameters.AddWithValue("@StuID", stuid);


                // 2.2 执行命令对象
                result = command.ExecuteScalar().ToString();

                // 3. 关闭连接
                connection.Close();
            }
            catch (Exception e)
            {
                ;
            }

            return result;
        }
    }
}