Sobald ich auf "nach Update suchen" klicke, erhalte ich folgende Fehlermeldung:


************** Ausnahmetext **************
System.Net.WebException: Ausnahmefehler während einer WebClient-Anforderung. ---> System.IO.IOException: Der Prozess kann nicht auf die Datei C:\Users\Jörg\AppData\Roaming\Wetterwarnung\Versio n.txt zugreifen, da sie von einem anderen Prozess verwendet wird.
bei System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
bei System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
bei System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
bei System.Net.WebClient.DownloadFile(Uri address, String fileName)
--- Ende der internen Ausnahmestapelüberwachung ---
bei System.Net.WebClient.DownloadFile(Uri address, String fileName)
bei Microsoft.VisualBasic.MyServices.Internal.WebClien tCopy.DownloadFile(Uri address, String destinationFileName)
bei Microsoft.VisualBasic.Devices.Network.DownloadFile (Uri address, String destinationFileName, ICredentials networkCredentials, Boolean showUI, Int32 connectionTimeout, Boolean overwrite, UICancelOption onUserCancel)
bei Microsoft.VisualBasic.Devices.Network.DownloadFile (String address, String destinationFileName, String userName, String password, Boolean showUI, Int32 connectionTimeout, Boolean overwrite, UICancelOption onUserCancel)
bei Microsoft.VisualBasic.Devices.Network.DownloadFile (String address, String destinationFileName, String userName, String password, Boolean showUI, Int32 connectionTimeout, Boolean overwrite)
bei Wetterwarnung.Hauptfenster.programmupdate()
bei Wetterwarnung.Hauptfenster.NachUpdateSuchenToolStr ipMenuItem_Click(Object sender, EventArgs e)
bei System.Windows.Forms.ToolStripItem.RaiseEvent(Obje ct key, EventArgs e)
bei System.Windows.Forms.ToolStripMenuItem.OnClick(Eve ntArgs e)
bei System.Windows.Forms.ToolStripItem.HandleClick(Eve ntArgs e)
bei System.Windows.Forms.ToolStripItem.HandleMouseUp(M ouseEventArgs e)
bei System.Windows.Forms.ToolStripItem.FireEventIntera ctive(EventArgs e, ToolStripItemEventType met)
bei System.Windows.Forms.ToolStripItem.FireEvent(Event Args e, ToolStripItemEventType met)
bei System.Windows.Forms.ToolStrip.OnMouseUp(MouseEven tArgs mea)
bei System.Windows.Forms.ToolStripDropDown.OnMouseUp(M ouseEventArgs mea)
bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
bei System.Windows.Forms.Control.WndProc(Message& m)
bei System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
bei System.Windows.Forms.ToolStrip.WndProc(Message& m)
bei System.Windows.Forms.ToolStripDropDown.WndProc(Mes sage& m)
bei System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
bei System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Geladene Assemblys **************
mscorlib
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll.
----------------------------------------
Wetterwarnung
Assembly-Version: 0.0.0.36.
Win32-Version: 0.0.0.2.
CodeBase: file:///C:/Program%20Files/Wetterwarnung/Wetterwarnung.exe.
----------------------------------------
Microsoft.VisualBasic
Assembly-Version: 8.0.0.0.
Win32-Version: 8.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.VisualBasic/8.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll.
----------------------------------------
System
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll.
----------------------------------------
System.Windows.Forms
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll.
----------------------------------------
System.Drawing
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll.
----------------------------------------
System.Runtime.Remoting
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Runtime.Remoting/2.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll.
----------------------------------------
System.Windows.Forms.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms.resources/2.0.0.0_de_b77a5c561934e089/System.Windows.Forms.resources.dll.
----------------------------------------
System.Configuration
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll.
----------------------------------------
System.Xml
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll.
----------------------------------------
mscorlib.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll.
----------------------------------------
Microsoft.mshtml
Assembly-Version: 7.0.3300.0.
Win32-Version: 7.0.3300.0.
CodeBase: file:///C:/Windows/assembly/GAC/Microsoft.mshtml/7.0.3300.0__b03f5f7f11d50a3a/Microsoft.mshtml.dll.
----------------------------------------
System.resources
Assembly-Version: 2.0.0.0.
Win32-Version: 2.0.50727.1434 (REDBITS.050727-1400).
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.resources/2.0.0.0_de_b77a5c561934e089/System.resources.dll.
----------------------------------------


Betriebssystem: Windows Vista Ultimate 32bit mit SP1