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    <p>It's probably because you're trying to use functions that exist in your first window from the second one as if they were static, but they aren't.</p> <p>You can try to solve this problem this way:</p> <ul> <li><p>in the <strong>second</strong> form create a property with class of your first form, like:</p> <pre><code>class Form1 : Form { //this property will store reference to the first form public Form1 AssociatedFirstForm { get; set; } //... } </code></pre></li> <li><p>Then <strong>in the code where you create the second form</strong>, assign the first form to this property, which can look like this (if you create the second form from the first one):</p> <pre><code>... Form2 secondForm = new Form2(); secondForm.AssociatedFirstForm = this; ... </code></pre></li> </ul> <p>or like this (if you create both forms from another part of code):</p> <pre><code> ... Form1 firstForm = new Form1(); Form2 secondForm = new Form2(); secondForm.AssociatedFirstForm = firstForm; ... </code></pre> <ul> <li><p>then, in your <strong>second</strong> form you should be able to call a method from the first form like this:</p> <pre><code>... var myResultFromAnotherWindow = this.AssociatedFirstForm.SampleMethodToCall(); ... </code></pre></li> </ul> <p>I suppose you should also read more about using <a href="http://msdn.microsoft.com/en-us/library/79b3xss3%28v=vs.80%29.aspx" rel="nofollow">static classes and class members</a> and <a href="http://msdn.microsoft.com/en-us/library/k6sa6h87%28v=vs.80%29.aspx" rel="nofollow">creating instances of objects</a>. It should make it clear to you how and when to use them.</p> <p><strong>Update</strong></p> <p>I haven't written it clear enough, but you should avoid to set expose methods or properties as public if it's not really needed. </p> <p>If you want to create good code structure in your application and learn how it should be done, look for some articles about object oriented programming.</p> <p>Some sample links:</p> <ul> <li><a href="http://www.c-sharpcorner.com/UploadFile/tusharkantagarwal/objectorientedcsharp11162005070743AM/objectorientedcsharp.aspx" rel="nofollow">http://www.c-sharpcorner.com/UploadFile/tusharkantagarwal/objectorientedcsharp11162005070743AM/objectorientedcsharp.aspx</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/dd460654.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/dd460654.aspx</a></li> </ul> <p>Knowing <strong><em>eventing mechanism</em></strong> also can be useful: <a href="http://msdn.microsoft.com/en-us/library/awbftdfh.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/awbftdfh.aspx</a>.</p>
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    1. POAccessing functions from other forms
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    1. USLukasz M
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    1. COSo, I realize that this is for a beginner, but the whole "Keep a reference to the mainform and make all methods public" is an anti-pattern if I've ever seen one. A better solution would use events to signal to the parent form that something occurred, allowing it to update its state as needed in response. I just can't give this an upvote as it is currently written.
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      1. USEd S.
    2. COI tried this, but now i'm getting a different error. This time, it's Error 2 The item was specified more than once in the "Resources" parameter. Duplicate items are not supported by the "Resources" parameter. I put the associated class at the very top, just above public partial class Form2 : Form I'm not sure if this is the right place, but it has got rid of the original error. Thanks a lot for the help so far =]
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      1. USGraham Charlesby
    3. CO@Ed S.: I'm not telling to make all the methods public, because, as you've already said, it would be against object oriented programming concept. However, if a method (or a property) is a special thing that form does, it can expose it as public, so another form (i.e. its parent form) can use it (like reading `FileName` from `OpenFileDialog` form). Maybe I should've written not to abuse exposing public members within the answer.
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