private void button2_Click(object sender, EventArgs e)
{
注册 form2 = new 注册();
form2.Show();
this.Hide();
}
private void button1_Click(object sender, EventArgs e)
{
String userid, password;
userid = textBox1.Text;
password = textBox2.Text;
String ConnstrWindows = @"Data Source=LAPTOP-6HF7DH62;Initial Catalog=Demo;Integrated Security=True";
SqlConnection SqlCon = new SqlConnection(ConnstrWindows);
SqlCon.Open(); //打开数据库
String Sql = "select userid,password from [user] where userid='" + userid + "' and password='******'";
SqlCommand sqlCommand = new SqlCommand(Sql, SqlCon);
SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();
if (sqlDataReader.HasRows)
{
Form3 form3 = new Form3();
form3.Show();
this.Hide();
}
else
{
DialogResult dr = MessageBox.Show("是否注册新用户？", "登录失败", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (dr == DialogResult.Yes)
{
注册 form2 = new 注册();
form2.Show();
this.Hide();
}
else
{
this.Show();
}
}
}