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POHow can i enable/disable a button in a backgroundworker DoWork event?
 

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  1. POHow can i enable/disable a button in a backgroundworker DoWork event?
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    <p>I have this method:</p> <pre><code>private void CreateDriversList() { try { StreamWriter w = new StreamWriter(contentDirectory + "\\" + "Drivers.txt"); w.WriteLine("Module Name Display Name " + " " + " Driver Type"); w.WriteLine("=========== ============ " + " " + " ==========="); System.Management.SelectQuery query = new System.Management.SelectQuery("Win32_SystemDriver"); System.Management.ManagementObjectSearcher searcher = new System.Management.ManagementObjectSearcher(query); foreach (System.Management.ManagementObject ManageObject in searcher.Get()) { w.WriteLine("{0,-22} {1,-75} {2}", ManageObject["Namedfgfdg"], ManageObject["DisplayName"], ManageObject["ServiceType"]); driversListNumbers += 1; } w.Close(); Logger.Write("***** Drivers Text File Have Been Created *****"); } catch(Exception err) { Logger.Write("There was an exception" + Environment.NewLine + err); SendEmail.Enabled = true; } } </code></pre> <p>This method is called from the DoWork event and when i run my program im getting exception:</p> <p>Cross-thread operation not valid: Control 'SendEmail' accessed from a thread other than the thread it was created on</p> <pre><code>System.InvalidOperationException was unhandled by user code HResult=-2146233079 Message=Cross-thread operation not valid: Control 'SendEmail' accessed from a thread other than the thread it was created on. Source=System.Windows.Forms StackTrace: at System.Windows.Forms.Control.get_Handle() at System.Windows.Forms.Control.OnEnabledChanged(EventArgs e) at System.Windows.Forms.ButtonBase.OnEnabledChanged(EventArgs e) at System.Windows.Forms.Control.set_Enabled(Boolean value) at Diagnostic_Tool_Blue_Screen.Form1.CreateDriversList() in d:\C-Sharp\Diagnostic Tool Blue Screen\Diagnostic Tool Blue Screen\Diagnostic Tool Blue Screen\Form1.cs:line 135 at Diagnostic_Tool_Blue_Screen.Form1.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in d:\C-Sharp\Diagnostic Tool Blue Screen\Diagnostic Tool Blue Screen\Diagnostic Tool Blue Screen\Form1.cs:line 177 at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e) at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument) InnerException: </code></pre>
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    1. USDanielVest
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      1. POHow can i enable/disable a button in a backgroundworker DoWork event?
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    1. COUse Dispatcher for it, but use google next time, it's easy to find
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    2. COIs this WPF or Windows Forms application? From the error it looks like Windows Forms so you'll need to use the old InvokeRequired check or use the BackgroundWork report progress. http://msdn.microsoft.com/en-us/library/ka89zff4.aspx
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