Question

Possible Duplicate:
Does not contain a constructor that takes 0 arguments

I have a DAL class called getData with a constructor that forces you to pass the connection string:

namespace AQProduct
{
  public class getData
  {
    public getData(string strConnectionString)
    {
    }
  }
 }

I have classes that do the actual work:

namespace AQProduct
{
  public class User_DL : getData
  {
  }
}

Build fails with

‘AQProduct.getData’ does not contain a constructor that takes 0
arguments

How do I get this to work?

Answer 1

In a (non-static) class, if you don’t add a constructor of your own, one is implicitly created of the form:

public ClassName : base() { }

i.e. call the base-class’s parameterless constructor. Since that doesn’t exist, you will need to add a custom constructor, for example:

public User_DL() : base("some fixed value from somewhere") {}

or:

public User_DL(string connectionString) : base(connectionString) {}