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copied!<p>You shouldn't be storing a <code>Form4</code> object in your <code>food</code> class. Your code as it is creates a brand new <code>Form4</code> every time the <code>food</code> object is created. As shown in the line:</p> <pre><code>public Form4 form = new Form4(); </code></pre> <p>This won't actually be shown on screen though as you do nothing else with the form except add items to the <code>ComboBox</code>, which also wouldn't show on the screen.</p> <p>Even if you were to get it shown on the screen, you will still get an error similar to:</p> <pre><code>Form4.comboBox1 is inaccessible due to its protection level </code></pre> <p>This is due to the fact that the <code>ComboBox</code> is created internally with private access modifier. (See <a href="http://msdn.microsoft.com/en-us/library/ms173121.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms173121.aspx</a> for more details).</p> <p>What you need to do is get your existing <code>Form4</code> to ask the <code>food</code> object to populate it's <code>ComboBox</code> by passing the <code>ComboBox</code> to a method on the <code>food</code> object similar to this example (in your <code>Form4</code> code not your <code>food</code> code):</p> <pre><code>private void Form4_Load(object sender, EventArgs e) { food f = new food(); //or however you wanted to create the object f.AddTypesToComboBox(this.comboBox1); } </code></pre> <p>The <code>AddTypesToComboBox</code> method would be defined like this in your <code>food</code> object:</p> <pre><code>public void AddTypesToComboBox(ComboBox box) { for (int i = 0; i < type.Length; i++) { box.Items.Add(type[i]); } } </code></pre> <p>Also, at the moment the function won't actually add anything to the <code>ComboBox</code> as your <code>type</code> array is not being filled with data. You need to call <code>settypes();</code> in the <code>food</code> object's constructors like this:</p> <pre><code>public food(string[] Name1, string[] Name, string[] Type1, int[] kcal) { settypes(); name1 = Name1; name = Name; type = Type1; calories_ref = kcal; } public food() { settypes(); } </code></pre> <p>You will need to remove <code>public Form4 form = new Form4();</code> from your variable declaration section as well as removing the following from your <code>settypes()</code> method:</p> <pre><code>for (int i = 0; i < type.Length; i++) { form.comboBox1.Items.Add(type[i]); } </code></pre> <p>Your <code>settypes()</code> should only fill the data into the array, and not try and add it to the <code>ComboBox</code>.</p>

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