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POProblem : InvokeRequired is always False when trying to show the form in c# windows application
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copied!<p>I am trying to implement single instance of the form. Because my application is all about hiding and showing different form dynamically according to some runtime values. </p> <hr> <p>when i want to show the Trainee_Login form from a class file, i do this...</p> <p>Trainee_login ShowTraineelogin = Trainee.login.TraineeloginRef; ShowTraineelogin.ShowScreen();</p> <hr> <p>when i want to hide the Trainee_Login form from a class file, i do this...</p> <p>Trainee_login HideTraineelogin = Trainee.login.TraineeloginRef; HideTraineelogin.HideScreen();</p> <hr> <p>Problem is the InvokeRequired is always false and the else condition gets executed. I am using the same pattern for other forms too, where the Invokerequired is true and if condition of showscreen() is executed. Same problem for Hidescreen() as well.</p> <p>Am i missing something ??</p> <hr> <p>Code in my Trainee_login form :</p> <pre><code>private static Trainee_Login Trainee_LoginInstance = null; public static Trainee_Login Trainee_LoginRef { get { if (Trainee_LoginInstance == null) Trainee_LoginInstance = new Trainee_Login(); return Trainee_LoginInstance; } } public void showScreen() { if (this.InvokeRequired == true) { this.Invoke(new MethodInvoker(this.showScreen)); } else { this.Show(); } } public void hideScreen() { if (this.InvokeRequired == true) { this.Invoke(new MethodInvoker(this.hideScreen)); } else { this.Hide(); } } </code></pre>

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