C#修改密码修改

dick804 2012-05-23 10:13:43

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.Data.SqlClient;
namespace WindowsFormsApplication1
{
public partial class Form5 : Form
{
public Form5()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
if (textBox2.Text.Trim().Length == 0 || textBox3.Text.Trim().Length == 0 || textBox4.Text.Trim().Length == 0)
{
MessageBox.Show("请输入完整！");
return;
}

if (textBox3.Text.Trim() != textBox4.Text.Trim())
{
MessageBox.Show("两次密码输入不一致！");
return;
}

String ConnString = "Data Source=.;Initial Catalog=WageManage;User ID=sa;password=147258369;";
SqlConnection conn = new SqlConnection(ConnString);
DataTable dt = new DataTable();

String sql = "SELECT * FROM stuff where StuffID= StuffID and Password = " + textBox2.Text.Trim();

try
{
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
da.Fill(dt);
}
catch (Exception Err)
{
MessageBox.Show(Err.Message);
}

if (dt.Rows.Count == 0)
{
MessageBox.Show("旧密码输入错误！");

dt.Dispose();
}
else
{
sql = "UPDATE Stuff set Password ='" + textBox3.Text.Trim() + "' where StuffID= '" + "'";

SqlCommand cmd = new SqlCommand();
cmd.CommandText = sql;
cmd.Connection = conn;
try
{
conn.Open();
cmd.ExecuteNonQuery();
}
catch (Exception Err)
{
MessageBox.Show("更新出现异常！");
}
finally
{
conn.Close();
}

MessageBox.Show("密码更新成功！");

}
}

private void button2_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
this.Hide();
if (frm2.ShowDialog() == DialogResult.OK)
{
this.Show();
}
}

private void Form5_Load(object sender, EventArgs e)
{

}
}
}

点了修改之后提示成功但是数据库数据却没有变化求大神指点

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