asp.net c# 中修改密码的语句怎么写？

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.Data.SqlClient;

public partial class ChangePsw : System.Web.UI.Page
{
SqlConnection cn;
protected void Page_Load(object sender, EventArgs e)
{
if (Session["branch"].ToString() == "0" || Session["branch"].ToString() == "1" || Session["branch"].ToString() == "2")
{

}
else
{
Response.Write("请登入后再操作，<a href='default.aspx'>返回登录</a>");
Page.Response.End();
}
string strconn = ConfigurationManager.AppSettings["

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