Help needed with "Unit Testing" to test a method!

dr_iton

I created a three layer windows based application. I'm trying to make a unit testing using NUINT, but the problem is that I don't know how to access the method.
I created my application in this manner :
I'll try to test the method Shto(Klasa obj)
Business Object namespace "BO"

namespace BO
{
public class Klasa
{
private int k_ID_Klasa;
private int k_KlasaViti;
private int k_Paralelja;

    public Klasa()
    {
    }

    public int ID_Klasa
    {
        get { return k_ID_Klasa; }
        set { k_ID_Klasa = value; }
    }

    public int KlasaViti
    {
        get { return k_KlasaViti; }
        set { k_KlasaViti = value; }
    }

    public int Paralelja
    {
        get { return k_Paralelja; }
        set { k_Paralelja = value; }
    }
}

}

Data Access Layer "DAL"

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namespace DAL
{
public class KlasaDB
{
public KlasaDB()
{

    }

    public static void Shto(Klasa obj)
    {
        SqlConnection sqlConn = new SqlConnection(StringKoneksioni.Stringu);
        SqlCommand sqlCmd = new SqlCommand("procShtoKlasa", sqlConn);
        sqlCmd.CommandType = CommandType.StoredProcedure;
        sqlCmd.Parameters.AddWithValue("@KlasaViti", obj.KlasaViti);
        sqlCmd.Parameters.AddWithValue("@Paralelja", obj.Paralelja);
        sqlConn.Open();
        sqlCmd.ExecuteNonQuery();
        sqlConn.Close();
    }
 }

}

Business Logic Layer "BLL"

namespace BLL
{
public class KlasaIURD
{
public KlasaIURD()
{

        }

        public static void Shto(Klasa obj)
        {
            KlasaDB.Shto(obj);
        }
}

}

I created the references for the namespaces needed in the project and also I created a testing class but the problem is that I don't know how to access the class method, that means I'm stacked in the following class:

namespace ScoMan_TI.NUnit_Testing
{
[TestFixture]
class Klasa_Testuese
{
Klasa klasa;

    [SetUp]
    public void initKlasa()
    {

        //int ID_Klasa = 15;
        //int KlasaViti = 12;
        //int Paralelja = 5;
        //KlasaDB = new KlasaDB()
        //KlasaDB.Shto()

//The problem is at the following line, I tryed
//klasa = new Shto(Klasa obj);
//And also
// klasa = new Klasa(ID_Klasa, KlasaViti, Paralelja)
// no such of method exists with three parameters.
}

}

}

Thank you in advance for your reply.
Cheers