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POSystem.InvalidOperationException: Collection was modified; enumeration operation may not execute when form closes
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  1. POSystem.InvalidOperationException: Collection was modified; enumeration operation may not execute when form closes
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    copied!<h1><strong>I fixed this issue by removing the line shapes from the form.</strong></h1> <h1>Original Post</h1> <p>When my form closes I get the following error:</p> <blockquote> <blockquote> <p>System.InvalidOperationException: Collection was modified; enumeration operation may not execute</p> </blockquote> </blockquote> <p>This only appears when the program is deployed on a machine not during debug. If I hide the form it doesn't occur only when the form is closed.</p> <p>Any help is greatly appreciated as this is becoming really annoying now. Thanks in advance,<br/> Craig</p> <p>p.s. Below is the FormClosed event</p> <pre><code> 'Disconnect from database cn.Close() cn.Dispose() </code></pre> <h3>Stack Trace</h3> <pre><code> ************** Exception Text ************** System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) at System.Collections.Generic.List`1.Enumerator.MoveNextRare() at System.Collections.Generic.List`1.Enumerator.MoveNext() at Microsoft.VisualBasic.PowerPacks.ShapeCollection.Dispose(Boolean disposing) at Microsoft.VisualBasic.PowerPacks.ShapeContainer.Dispose(Boolean disposing) at System.ComponentModel.Component.Dispose() at System.Windows.Forms.Control.Dispose(Boolean disposing) at System.ComponentModel.Component.Dispose() at System.Windows.Forms.Control.Dispose(Boolean disposing) at System.Windows.Forms.TabControl.Dispose(Boolean disposing) at System.ComponentModel.Component.Dispose() at System.Windows.Forms.Control.Dispose(Boolean disposing) at System.Windows.Forms.Form.Dispose(Boolean disposing) at EquiManager.frmEditJumpingShow.Dispose(Boolean disposing) at System.ComponentModel.Component.Dispose() at System.Windows.Forms.Form.WmClose(Message&amp; m) at System.Windows.Forms.Form.WndProc(Message&amp; m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&amp; m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&amp; m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) </code></pre>
 

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