setstu.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;


namespace LoginFrame
{
    public partial class setstu : Form
    {
        public setstu()
        {
            InitializeComponent();
        }

        private void setstu_Load(object sender, EventArgs e)
        {

        }

        private void txtname_TextChanged(object sender, EventArgs e)
        {

        }

        private void txtpsw_TextChanged(object sender, EventArgs e)
        {

        }

        private void txtpsw2_TextChanged(object sender, EventArgs e)
        {

        }

        private void btnregedit_Click(object sender, EventArgs e)
        {
            if (loginpwd.Text == loginpwd1.Text)
            {
                SqlConnection conn = new SqlConnection(DbHelper.connString);
                try
                {
                    conn.Open();
                    // 更改学生登录密码
                    string sql = string.Format("UPDATE stuinfo set loginpwd='{0}' where loginid='{1}';", loginpwd.Text, username.Text);
                    SqlCommand comm = new SqlCommand(sql, conn);

                    int a = comm.ExecuteNonQuery();
                    if (a == 1)
                    {
                        MessageBox.Show("更改成功！");
                        this.Close();
                    }
                    else