private void button1_Click(object sender, EventArgs e)
{
主页 fm = new 主页();
fm.Show();
this.Hide();
}
private void button1_Click(object sender, EventArgs e)
{
try {
string UserName = textBox1.Text.Trim();
string PassWord = textBox2.Text.Trim();
if (UserName == "")
{
MessageBox.Show("用户名为空，请输入用户名", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (PassWord == "")
{
MessageBox.Show("密码为空，请输入用户名", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
string str = "SELECT count(*) from Users WHERE username= '******' and password= '******'";
string connectionStr = "Data Source=MYCOMPUTER\\SQLEXPRESS;Integrated Security=True";
SqlConnection conn = new SqlConnection(connectionStr); //创建链接对象
SqlCommand cmd = new SqlCommand(str, conn); //创建命令对象
conn.Open(); //如果一个连接对象打开，那么必须在try最后关闭它
Console.WriteLine("数据连接成功打开");
SqlDataReader sdr = cmd.ExecuteReader(); //创建数据读取器对象
sdr.Read();
sdr.Close();
int n = (int)cmd.ExecuteScalar();//传回第一行，赋给n
if (n >= 1)
{
主页 fm = new 主页();
fm.Show();
this.Hide();
}
else
{
MessageBox.Show("用户名或密码错误", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);//密码错误
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);//打印异常
}
}