Component does not exist in the current context - C#

Question

I have this code (the problem lines have comments above them):

private async void btn_loginAdmin_Click(object sender, RoutedEventArgs e)
        {
            // 'txt_adminId' does not exist in the current context.
            if (txt_adminId.Text = "root")
            {
                // 'txt_adminPw' does not exist in the current context.
                if (txt_adminPw.Password = "password")
                {
                    var msg_login = new MessageDialog("Logged in!");
                    await msg_login.ShowAsync();
                }
                else
                {
                    var msg_login = new MessageDialog("Wrong password!");
                    await msg_login.ShowAsync();
                }
            }
            else
            {
                var msg_login = new MessageDialog("Wrong combo!");
                await msg_login.ShowAsync();
            }
        }

I have always had that problem with C#. I don't know what it means. But I'm sure that in this file's .xaml, those 2 text boxes exist.

This is a Windows Store C# program.

EDIT:

Here's the output:

1>C:\Database\GH3_WSE\GH3_WSE\login_admin.xaml.cs(119,17,119,42): error CS0029: Cannot implicitly convert type 'string' to 'bool'
1>C:\Database\GH3_WSE\GH3_WSE\login_admin.xaml.cs(121,21,121,54): error CS0029: Cannot implicitly convert type 'string' to 'bool'

To make the MessageDialog work. I tried removing them but it doesn't fix the problem. — Wix, Oct 11 '14 at 09:26
I see. No experience with WP, but seems to me connected with async and threads. Using MVVM could help you here perhaps. — Vojtěch Dohnal, Oct 11 '14 at 09:39
I hear that a lot. But I don't exactly know how to start with it. — Wix, Oct 11 '14 at 09:41
@Wix are you sure you have a valid check here `txt_adminId.Text = "root"` ? Shouldn't it be `==`? Same on this line `if (txt_adminPw.Password = "password")` — Shmwel, Oct 11 '14 at 09:43
@SJD I've been so soaked up with COBOL right now that I forgot the fact that in C, '=' and '==' have different meanings. This answers my question. Thanks! — Wix, Oct 11 '14 at 09:46

score 0 · Answer 1 · answered Oct 11 '14 at 09:12

0

Check the x:Class on xaml page has the exact name of your .cs class.

It should be like:

x:Class = "ProjectName.C#ClassName"

answered Oct 11 '14 at 09:12

Shaharyar

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They're exactly the same. – Wix Oct 11 '14 at 09:21

score 0 · Answer 2 · edited May 23 '17 at 10:26

I guess you forgot twice the = operator on the following lines:

if (txt_adminId.Text = "root")

should be

if (txt_adminId.Text == "root")

and also on this line

if (txt_adminPw.Password = "password")

So, you might want to write this:

private async void btn_loginAdmin_Click(object sender, RoutedEventArgs e)
        {
            // 'txt_adminId' does not exist in the current context.

            if (txt_adminId.Text == "root")
            {
                // 'txt_adminPw' does not exist in the current context.
                if (txt_adminPw.Password == "password")
                {
                    var msg_login = new MessageDialog("Logged in!");
                    await msg_login.ShowAsync();
                }
                else
                {
                    var msg_login = new MessageDialog("Wrong password!");
                    await msg_login.ShowAsync();
                }
            }
            else
            {
                var msg_login = new MessageDialog("Wrong combo!");
                await msg_login.ShowAsync();
            }
        }

Also, I would recommend to use String.Equals instead of ==, because you would like to compare values rather than reference. Note that String.Equals compares proper values while == also takes into consideration their references.

See: Why would you use String.Equals over ==?

Component does not exist in the current context - C#

2 Answers2