C# reference to a dll file i created doesn't work as it should

Question

i'm using microsoft visual C# 2010 express to write a form program to read and write to an access database.

i created a class that is designed to read/write to the database file, saved it under a namespace and created a dll from it.

it is set as ".net Framework 4"

in my main program i added the reference to the dll file but when i try to add it to the code with

using Database;

it won't work even that the Database is in the reference of the namespace.

am i doing something wrong? or is there another way to use the commands from Database in my main program other then copying it to it?

// update // solved added public to all database public and DataBase db = new DataBase();

DATABASE.cs is use it for dll

using System;
using System.Collections.Generic;
using System.Data.OleDb;

namespace Database
{
    public class DataBase
    {

        public DataBase()
        {
        }

        public void ItemInsert(string name,string creator,string publishing,string itemType,string genere, string year)

the main program

using System;
using System.Windows.Forms;
using Database;


namespace library
{
    public partial class newItemForm : Form
    {

        private void btnConfirmNewItemClick(object sender, EventArgs e)
        {
            DataBase db = new DataBase(); //this solved it
            db.ItemInsert(txtItemNameType.Text, txtEditorType.Text, txtCreatorType.Text, comboBoxType.Text, txtGenereType.Text, txtYearType.Text);
        }

    }
}

What is the full name of the type you are trying to use? name and containing namespace — JaredPar
Is the class you're trying to use public in the namespace Database? — Joachim Isaksson
@user501160, please update your question with 2 lines from your Database class' file: namespace XXXXX and ??? class Database so it is possible to make better suggestion. BTW, easier way to add namespace is to type class name and let VisualStudio to add namespace itself by clicking on small rectangle next to class name in sources. — Alexei Levenkov
using Database; is not 'adding a reference'. You need Project|Add Reference to do that. — Henk Holterman
added in the first post solved by added public to all database functions and itself and adding DataBase db = new DataBase(); so with db.ItemInsert() i can use it now thx — Iakovl

Alex Alex · Accepted Answer · 2012-03-06T17:35:14

You also need to Add a Reference to said assembly in your current project. The using statement brings a referenced assembly into scope...

C# reference to a dll file i created doesn't work as it should

3 Answers