using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;using System.Data.SqlClient;namespace FoodManage{ public partial class fm_change_password : Form {  public fm_change_password()  {   InitializeComponent();  }  public string useridname = "";  private void bt_ok_Click(object sender, EventArgs e)  {   SqlConnection conn=new SqlConnection(fm_public.strcon);   conn.Open();   SqlDataAdapter sda = new SqlDataAdapter("SELECT Password FROM TUser WHERE UserIDName='" + useridname + "'", conn);   DataTable DT=new DataTable();   sda.Fill(DT);   if(DT.Rows[0]["Password"].ToString()!=tb_oldpass.Text)   {    MessageBox.Show("舊密碼錯誤請重新輸入");    return;   }   if (tb_newpassw.Text != tb_newpass.Text)   {    MessageBox.Show("兩次密碼不相同請重新輸入");    return;   }   SqlCommand cmd = new SqlCommand("UPDATE TUser SET Password=@Password WHERE UserIDName='" + useridname + "'", conn);   cmd.Parameters.Add("@Password",SqlDbType.VarChar,128).Value=tb_newpassw.Text;   cmd.ExecuteNonQuery();   MessageBox.Show("修改密碼成功！(*￣

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