登录密码错误
try
{
if (reader.Read())
{
Response.Write(tbUserPwd.Text.ToString());
Response.Write(reader.GetString(1).ToString());
if (reader.GetString(1).ToString() == tbUserPwd.Text.ToString())
{
Session[ "userLoginName "] = reader.GetString(0).ToString();
Response.Write( "登录成功！ ");
}
else
{
Response.Write( "登录密码错误！ ");
}

}
else
{
Response.Write( "此用户不存在！ ");
}
}
finally
{
reader.Close();
loginConn.Close();
loginConn.Dispose();
}

[解决办法]
Response.Write( <script> window.alert( '登陆成功 ') </script> );
[解决办法]
加上.Trim()试试看, 可能是空格吧