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copied!<p>According to the exception </p> <pre><code>Constructor on type 'System.Windows.Forms.ToolStripControlHost' not found. </code></pre> <p>I found some information on the MSDN Forum.</p> <p>This happends because the <code>ToolStripControlHost</code> class does not have a constructor with no parameter. </p> <p>To solve this problem, you can create your own ToolStripControlHost with a none-parameter constructor and make the ToolStripMaskedTextBox inherited from your ToolStripControlHost. Try something like the following</p> <pre><code>//Declare a class that inherits from ToolStripControlHost. [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip | ToolStripItemDesignerAvailability.StatusStrip)] public class ToolStripMaskedTextBox : MyCustomToolStripControlHost { // Call the base constructor passing in a MaskedTextBox instance. public ToolStripMaskedTextBox() : base(CreateControlInstance()) { } public MaskedTextBox MaskedTextBox { get { return Control as MaskedTextBox; } } private static Control CreateControlInstance() { MaskedTextBox mtb = new MaskedTextBox(); mtb.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle; mtb.MinimumSize = new System.Drawing.Size(100, 16); mtb.PasswordChar = '*'; return mtb; } } public class MyCustomToolStripControlHost : ToolStripControlHost { public MyCustomToolStripControlHost() : base(new Control()) { } public MyCustomToolStripControlHost(Control c) : base(c) { } } </code></pre> <h3>This will fix the problem with your exception.</h3> <p>The Problem with the Forms Designer (ToolStripMaskedTextBox is not visible after running the app) is not solved but you can close the designer and open the file again. </p> <p>Then you can go on without any problems.</p> <p><strong>Hope this helps</strong></p>

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