好的,我基本上是在尝试验证输入的用户名是否重复,但是while循环中的字符串比较出现了问题protected void BtnConfirmSignup_Click(object sender, EventArgs e) int f = 0;
SqlConnection con = new SqlConnection("Data Source=(localdb)\\MSSQLlocalDB;Initial Catalog=traveller;Integrated Security=True;Pooling=Fals