private void button1_Click_1(object sender, EventArgs e)
{
try
{
if (textBox1.Text.Trim() == "")
{
MessageBox.Show("请输入用户名！", "错误提示");
textBox1.Focus();
}
else if (textBox2.Text.Trim() == "")
{
MessageBox.Show("请输入密码！", "错误提示");
textBox2.Focus();
}
else
{
//账号 密码
string user = textBox1.Text;
string pwd = textBox2.Text;
//连接数据库
string counstr = "Server=.;user=sa;pwd=15570104841;database=xscjglxt";
SqlConnection mycon = new SqlConnection(counstr);
string sql1 = "Select * from 学生信息表";
SqlDataAdapter da = new SqlDataAdapter(sql1, mycon);
DataSet ds = new DataSet();
da.Fill(ds, "学生信息表");
mycon.Open();
//查询是否存在这个账户
string sql = string.Format("Select count(用户名) from 用户信息表 where 用户名='{0}' and 密码='{1}'", user, pwd);
SqlCommand mycom = new SqlCommand(sql, mycon);
//是否存在第一个值！
int i = Convert.ToInt32(mycom.ExecuteScalar());
//大于零则是存在
if (i > 0)
{
MessageBox.Show("登录成功！", "登录提示");
flmlogin fl = new flmlogin();
fl.Show();
fl.dataGridView1.DataSource = ds;
this.Close();
}
else
{
MessageBox.Show("登录失败！", "错误提示");
textBox1.Text = "";
textBox2.Text = "";
textBox1.Focus();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
}
}
private void flmlogin_Load(object sender, EventArgs e)
{
this.Text = "学生成绩管理系统";
this.IsMdiContainer = true;
//登录界面
flmlogin flom1 = new flmlogin();
flom1.TopMost = true;
flom1.Show();
toolStripStatusLabel1.Text = "欢迎使用本系统......";
toolStripStatusLabel2.Text = "";
toolStripStatusLabel3.Text = DateTime.Now.ToString();
}