这个是第一个界面的代码：
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 登录x { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void userInfoBindingNavigatorSaveItem_Click(object sender, EventArgs e) { this.Validate(); this.userInfoBindingSource.EndEdit(); this.tableAdapterManager.UpdateAll(this.studentRecordDataSet); } private void Form1_Load(object sender, EventArgs e) { // TODO: 这行代码将数据加载到表“studentRecordDataSet1.UserInfo”中。您可以根据需要移动或删除它。 this.userInfoTableAdapter1.Fill(this.studentRecordDataSet1.UserInfo); // TODO: 这行代码将数据加载到表“studentRecordDataSet.UserInfo”中。您可以根据需要移动或删除它。 this.userInfoTableAdapter.Fill(this.studentRecordDataSet.UserInfo); } private void passwordLabel_Click(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { string connString = @"Data Source=.;Initial Catalog=studentrecord;Integrated Security=True"; SqlConnection conn = new SqlConnection(connString); string sql = "select count(*) from UserInfo where username='" + userNameComboBox.Text + "'and password='" + passwordTextBox.Text + "'"; conn.Open(); SqlCommand comm = new SqlCommand(sql, conn); int num = (int)comm.ExecuteScalar(); if (num > 0) { Form2 frm2 = new Form2(); frm2.Show(); } else { MessageBox.Show("对不起，用户名和密码并不匹配！", "登陆失败"); } conn.Close(); } private void userNameComboBox_SelectedIndexChanged(object sender, EventArgs e) { } private void passwordTextBox_TextChanged(object sender, EventArgs e) { } } }
这个是第二个界面的代码：
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; namespace 登录x { public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void label1_Click(object sender, EventArgs e) { } } }
运行结果如图：
