I'm familiar with the main Object Oriented concepts in programming and currently I'm teaching myself how to design classes.

I have a very simple class calld Company. Here's the code I have so far

```
using System;

namespace Addressbook
{
    public class Company
    {
        private string _companyId;
        private string _companyName;
        private string _companyType;
        private string[] _companyDetails;

        public Company()
        {

        }

        public string CompanyId
        {
            set
            {
                this._companyId = value;
            }
        }

        public string CompanyName
        {
            set
            {
                this._companyName = value;
            }
        }

        public string CompanyType
        {
            set
            {
                this._companyType = value;
            }
        }

        public string[] GetCompanyDetails()
        {

            return null;
        }

    }
}

```

What I'm now trying to do is implementing some methods to it and that's where I'm sort of lost.

The first method I'm thinking of is called `GetCompanyDetails()` which would gather data from a SQL database and then display it. Possibly in a DataGridView or something.

My problem is I can't figure out how I should write this method. Do I put all the SQL queries and connections inside it? Or do I just pass instances of them as parameters? What's the type I should return from the method?

Can someone please give me some guidelines on this?

And also, if you have links to any good tutorials/guides on this subject matter, please post them too.

Thank you.