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POC# set CheckBox value from external class
 

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  1. POC# set CheckBox value from external class
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    <p>I have external class for do some work with my form. I have some error end can't handle with it.</p> <p>My first variant </p> <pre><code>mainForm.CheckBox1.Checked = true; </code></pre> <p>it doesn't worked with an error<br> Cross-thread operation not valid: Control 'CheckBox1' accessed from a thread other than the thread it was created on</p> <p>So I tried like in folow post <a href="https://stackoverflow.com/questions/3789773/setting-the-value-of-a-checkbox-programmatically-in-c-sharp-wpf">stackoverflow question 1</a> but when I wrote</p> <pre><code>mainForm.CheckBox1.IsCheked = true </code></pre> <p>Compiler gives an error that<br> The error is 'System.Windows.Forms.Control' does not contain a definition for 'IsChecked' and no extension method 'IsChecked' accepting a first argument of type 'System.Windows.Forms.Control' could be found (are you missing a using directive or an assembly reference?)</p> <p>I saw and found answer in <a href="https://stackoverflow.com/questions/5548308/how-to-get-the-ischecked-property-of-a-winform-control">srackoverflow question 2</a></p> <p>But i can't casting my object because when I write</p> <pre><code>(CheckBox)mainForm.CheckBox1.IsCheked = true </code></pre> <p>it gives an error Can't find name of or namespace (are you missing a using directive or an assembly reference?) for CheckBox. I have <code>using System.Windows.Forms;</code> in the beginning of class.</p> <p>I'm a beginner in C# so may your give me some suggestions what I do wrong?</p>
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    1. COis it necessary to set the checked state during the thread function? (or can it be done after completion)
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    2. COI have some static function, which is called from MainForm. Something like `Dialogs.setCheckBox();` where Dialog is external class with functions. Is it necessary to create new thread for setting the CheckBox?
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    3. COIt sounds like your already on a separate thread, "Cross-thread operation" if your trying to set the checkbox on a static function then you must pass the checkbox you want to set into the SetCheckBox parameters
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