How to select username password and selectusertype from stored procedure in WPF C#

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SELECT TOP (1000) [company_id]
      ,[company_name]
      ,[caption]
      ,[address1]
      ,[address2]
      ,[mobileno]
      ,[email]
      ,[gstn]
      ,[CloudApi]
      ,[username]
      ,[password]
      ,[selectusertype]
      ,[uploadlogo]
      ,[activationkey]
  FROM [New_Restaurant_Application].[dbo].[add_profile]

What I have tried:

private void SignIn_Click(object sender, RoutedEventArgs e)
        {

            if (isValid())
            {
                SqlConnection conn = new SqlConnection(ConnectionString);
                conn.Open();
                //SqlCommand cmd = new SqlCommand("add_profile_details", conn);
                SqlDataAdapter sda = new SqlDataAdapter("SELECT username ='" + txtUsername.Text + "', password ='" + txtpassword.Password + "' , selectusertype = '"+cmboSelectusertype.Text+ "' from add_profile", conn);
                DataTable dt = new DataTable();  
                sda.Fill(dt);
                if (dt.Rows[0][0].ToString() == "")
                {
                    refresh();
                    Employee emp = new Employee();
                    emp.ShowDialog();
                }
                else
                {
                    MessageBox.Show("Invalid username or password"); 
                }
            }

Posted 2-Sep-22 2:59am

prashanth manoj

Updated 2-Sep-22 3:21am

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OriginalGriff · Answer 1 · 2022-09-02T03:21:00

Don't do it like that.
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?