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The event DoDragDrop failed when I was running the application at Design Mode. and when the cursor lose the focus of the application it produce the follow exception.

SharpDevelop Version : 2.2.1.2648
.NET Version         : 2.0.50727.42
OS Version           : Microsoft Windows NT 5.1.2600 Service Pack 2
Current culture      : Spanish (Ecuador) (es-EC)
Current UI language  : es-ES
Working Set Memory   : 184604kb
GC Heap Memory       : 45923kb

Exception thrown:
System.Runtime.InteropServices.COMException (0x8013134F): Object is in a zombie state. (Exception from HRESULT: 0x8013134F)
   at Debugger.Interop.CorDebug.ICorDebugAppDomain.GetProcess(ICorDebugProcess& ppProcess)
   at Debugger.Wrappers.CorDebug.ICorDebugAppDomain.get_Process()
   at Debugger.ManagedCallbackProxy.<>c__DisplayClass16.<CreateThread>b__15()
   at Debugger.MTA2STA.<>c__DisplayClass3.<EnqueueCall>b__0()
   at Debugger.MTA2STA.PerformAllCalls()
   at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbacks()

I don't know if i'm write bad my code or if it's an exception. I hope that It helps. Bye 

I don't think it's your code, or mine has the same defect...;)

Try doing your d&d with #D minimized. For me, this solved the problem.

To resume: If i Drag my object over the #D window (without dropping it), my application hangs but if i do not cross #D region, everyting is fine.

Hope this helps everybody.

I add my error code at the end.

Jacques.

SharpDevelop Version : 2.2.1.2622
.NET Version         : 2.0.50727.1378
OS Version           : Microsoft Windows NT 6.0.6000.0
Current culture      : English (Canada) (en-CA)
Current UI language  : en-US
Working Set Memory   : 114392kb
GC Heap Memory       : 33295kb

Exception thrown:
System.Runtime.InteropServices.COMException (0x8013134F): Object is in a zombie state. (Exception from HRESULT: 0x8013134F)
   at Debugger.Interop.CorDebug.ICorDebugAppDomain.GetProcess(ICorDebugProcess& ppProcess)
   at Debugger.Wrappers.CorDebug.ICorDebugAppDomain.get_Process() in c:\dev\Serralongue\src\AddIns\Misc\Debugger\Debugger.Core\Project\Src\Wrappers\CorDebug\Autogenerated\ICorDebugAppDomain.cs:line 180
   at Debugger.ManagedCallbackProxy.<>c__DisplayClassa.<Exception>b__9() in c:\dev\Serralongue\src\AddIns\Misc\Debugger\Debugger.Core\Project\Src\Debugger\Internal\ManagedCallbackProxy.cs:line 81
   at Debugger.MTA2STA.<>c__DisplayClass3.<EnqueueCall>b__0() in c:\dev\Serralongue\src\AddIns\Misc\Debugger\Debugger.Core\Project\Src\Debugger\Internal\MTA2STA.cs:line 37
   at Debugger.MTA2STA.PerformAllCalls() in c:\dev\Serralongue\src\AddIns\Misc\Debugger\Debugger.Core\Project\Src\Debugger\Internal\MTA2STA.cs:line 57
   at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
   at System.Windows.Forms.Control.InvokeMarshaledCallbacks()