private void btnLogin_Click(object sender, EventArgs e)
{
//判断是否输入用户名
if (tbUser.Text.Trim().Length == 0)
{
MessageBox.Show("请输入用户名！");
tbUser.Focus();
return;
}
//判断是否已输入密码
if (tbPwd.Text.Trim().Length == 0)
{
MessageBox.Show("请输入密码！");
tbPwd.Focus();
return;
}
//创建common对象
common com = new common();
//创建database对象
database db = new database();
//统计所输入的用户名和密码在对应数据表中的个数的查询语句
int t = 0;
string sql = "seclect count(*) from manager wherer username='******'and pwd='" + com.md5(tbPwd.Text.Trim()) + "'";
//将对应表中数据条数放在变量t中
t = db.runSqlInt(sql);
if (t > 0)
{
this.Hide();
main fmain = new main();
fmain.User = tbUser.Text.Trim();
fmain.Show();
}
else
{
MessageBox.Show("用户名或者密码错误！！");
}
}