Question

I have a function like this

try
    {


        using(var sConnection = new SqlConnection(ConnectionString))
        using(var sCommand = sConnection.CreateCommand())
        {
            sCommand.CommandText = @"SELECT 
                                           TABLE_NAME
                                          AS
                                           TABLES
                                        FROM 
                                           INFORMATION_SCHEMA.TABLE_CONSTRAINTS
                                       WHERE 
                                           CONSTRAINT_TYPE = 'PRIMARY KEY'
                                         AND
                                           TABLE_NAME <> 'dtProperties'
                                    ORDER BY
                                           TABLE_NAME";
            sConnection.Open();
            using(var reader = sCommand.ExecuteReader()) // Troublesome line
            {                    
                while(reader.Read())
                {
                    sb.AppendLine(reader.GetString(0));
                }
            }
        }

    }
    catch(Exception ex)
    {
        //All the exceptions are handled and written in the EventLog. 
        EventLog log = new EventLog("Application");
        log.Source = "MFDBAnalyser";
        log.WriteEntry(ex.Message);
    }
    return sb.ToString();
}

On debugging, it is giving the result till the connection is open but the var Reader is not reading the data.

Can anybody point out where the error is!!

Answer 1

Is your provided code the same you run?

Strange behaviour of ‘working’ in debug, but not in runtime, usually happens if you have self initializing get properties. Something like this:

private string _name;

public string Name
{
  get {
    if (_name == null)
    {
      name = string.Empty;
    }
    return _name;
  }
  set {_name = value;}
}

So if you use _name directly and debugger displays such a property, it ‘accidentally’ initializes your property before use.