UpdateUserInfo.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;

public partial class UpdateUserInfo : System.Web.UI.Page
{
  
    protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                if (Session["MemberName"] == null)
                {
                    Response.Write("<script language='javascript'>alert('没有登录，不能操作！');location='javascript:history.go(-1)';</script>");
                }
                else
                {
                    GetUserInfo();
                }
            }
        }
        private void GetUserInfo()
        {
            string sql = "select * from [User] where u_Num =" + Session["MemberName"]; 
            DataTable dt = DBHelper.GetDataSet(sql).Tables[0];

            this.TextBox1.Text = dt.Rows[0]["u_Num"].ToString();
            this.TextBox2.Text = dt.Rows[0]["u_PWD"].ToString();
            this.TextBox3.Text = dt.Rows[0]["u_PWD"].ToString();
            this.TextBox4.Text = dt.Rows[0]["u_Name"].ToString();
            this.TextBox5.Text = dt.Rows[0]["u_Age"].ToString();
            this.TextBox6.Text = dt.Rows[0]["u_Tel"].ToString();
            this.TextBox7.Text = dt.Rows[0]["u_Mail"].ToString();
            this.TextBox8.Text = dt.Rows[0]["u_Birthday"].ToString();


            this.TextBox9.Text = dt.Rows[0]["u_Place"].ToString();
            this.TextBox10.Text = dt.Rows[0]["u_Work"].ToString();
            this.TextBox11.Text = dt.Rows[0]["u_Intoduction"].ToString();
            this.TextBox12.Text = dt.Rows[0]["u_Hobby"].ToString();

            this.DropDownList1.Text = dt.Rows[0]["u_Sex"].ToString();
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            string u_Num = this.TextBox1.Text.Trim();
            string u_PWD = this.TextBox2.Text.Trim();
            string u_Sex = this.DropDownList1.SelectedItem.Text.Trim();
            string u_Name = this.TextBox4.Text.Trim();

            string u_Age = this.TextBox5.Text.Trim();
            string u_Tel = this.TextBox6.Text.Trim();
            string u_Mail = this.TextBox7.Text.Trim();