Question

I have this very simple method called to check if a user has a correct password. Any help on why it isn’t working? This is for Microsoft SQL Server.

public bool UserNameExists()
    {
        using (SqlConnection con = new SqlConnection("CONNECTION STRING AQUI!"))
        {
            con.Open();
            try
            {
                using (SqlCommand command = new SqlCommand(string.Format("SELECT * FROM Policia WHERE NumeroPlaca = '{0}' AND Password = '{1}'", Session.Contents["username"], Session.Contents["password"]), con))
                {
                    SqlDataReader reader = command.ExecuteReader();
                    if (reader.FieldCount > 0)
                    {
                        return true;
                    } 
                    else 
                    {
                        return false;
                    }
                }
            }
            catch
            {

            }

            return false;
        }
    }

Answer 1

FieldCount gets the number of columns in the current row, which will always be non-zero. You’re looking for the number of rows in the result set. Use the HasRows property.