"The remote server returned an error (404) not found"

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how to fix error "the remote server returned an error (404) not found". in asp.net c#

What I have tried:

public HttpResponseMessage get(string s, string p)
{

    DataSet dt = new DataSet();
    string query = "select Email_id,Password from User_Registraction where Email_id=" + s + "and Password=" + p;
    using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["EmployeeAppData"].ConnectionString))
    using (var cmd = new SqlCommand(query, con))
    using (var da = new SqlDataAdapter(cmd))
    {
        cmd.CommandType = CommandType.Text;
        da.Fill(dt);
    }

    return Request.CreateResponse(HttpStatusCode.OK,"ok");
}

when I check this in Postmen getting the error. Please suggest me if required any other details.

Posted 28-Feb-21 22:58pm

Member 15081437

Updated 28-Feb-21 23:14pm

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Richard MacCutchan 1-Mar-21 5:03am

You need to check the server logs.

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OriginalGriff · Accepted Answer · 2021-02-28T23:14:00

We can't help you: a 404 error means what the message says - you have asked for a page that doesn't exist. It is unlikely to be that code that generates such an error ...

But ... don't do it like that!
1) Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?

2) Never store passwords in clear text - it is a major security risk. There is some information on how to do it here: Password Storage: How to do it.[^]

And remember: this is web based and if you have any European Union users then GDPR applies and that means you need to handle passwords as sensitive data and store them in a safe and secure manner. Text is neither of those and the fines can be .... um ... outstanding. In December 2018 a German company received a relatively low fine of €20,000 for just that.