//管理员输入审核用户名时验证该用户是否存在，并提示
private void textBox2_KeyUp(object sender, KeyEventArgs e)
{
DBlink db = new DBlink();
if (db.DBconn())
{
string str = "select * from login_info where username='******'";
if (db.search(str))
{
label5.Text = "*删除用户！" + textBox2.Text + "?请点击删除按钮";
button2.Enabled = true;
}
else
{
label5.Text = "*用户不存在！";
button2.Enabled = false;
}
}
}
//管理员输入审核用户名时验证该用户是否存在，并提示
private void textBox1_KeyUp(object sender, KeyEventArgs e)
{
DBlink db = new DBlink();
if (db.DBconn())
{
string str = "select * from login_info where tag=0 and username='******'";
if (db.search(str))
{
label3.Text = "*该用户未审核！";
button1.Enabled = true;
}
else
{
label3.Text = "*用户不存在！";
button1.Enabled = false;
}
}
}