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Win32Exception (0x80004005): Class already exists 
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Joined: Sun Apr 27, 2008 4:40 pm
Posts: 1
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Post Win32Exception (0x80004005): Class already exists

I'm evaluating the EasyXLS and sometimes the following error occurs:

Line 75: Dim xls As New ExcelDocument
Line 76: Dim xlsWorksheet As New ExcelWorksheet("CLIENTES")
Line 77: xls.easy_addWorksheet(xlsWorksheet)

Source File: C:\sites\NetStoreManager2007\web\IEclientes.aspx.vb Line: 76

Stack Trace:

[Win32Exception (0x80004005): Class already exists]
System.Windows.Forms.WindowClass.RegisterClass() +1091
System.Windows.Forms.WindowClass.Create(String className, Int32 classStyle) +181
System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) +215
System.Windows.Forms.Control.CreateHandle() +213
System.Windows.Forms.Control.get_Handle() +60
System.Windows.Forms.Control.CreateHandle() +200
System.Windows.Forms.Control.get_Handle() +60
System.Windows.Forms.Control.CreateGraphicsInternal() +5
System.Windows.Forms.Control.CreateGraphics() +36
EasyXLS.Util.Conversion.b..cctor() +202

[TypeInitializationException: The type initializer for "EasyXLS.Util.Conversion.b" threw an exception.]
EasyXLS.Util.Conversion.b.a(Int32 A_0, Int16[] A_1, String A_2, Boolean A_3) +20
EasyXLS.ExcelSheet.setSheetName(String sheetName) +602
EasyXLS.ExcelSheet..ctor() +136
EasyXLS.ExcelWorksheet..ctor(String sheetName) +46
IEclientes.exportarBtn_Click(Object sender, EventArgs e) in C:\sites\NetStoreManager2007\web\IEclientes.aspx.vb:76
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
PeterBlum.VAM.Button.OnClick(EventArgs pE) +71
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1292

The vb source is:

Private Sub exportarBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles exportarBtn.Click

Dim xls As New ExcelDocument

Dim xlsWorksheet As New ExcelWorksheet("CLIENTES")


xlsWorksheet.easy_insertDataSet(GetClientesDataset, 0, 0, True)

Catch exc As Exception
   exportMsg.Text = exc.Message
End Try


End Sub

What I am doing wrong?


Sun Apr 27, 2008 5:02 pm

Joined: Fri Feb 03, 2006 12:23 pm
Posts: 173
Location: Brasov, Romania
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This is a .Net Framework defect. It is a recognized Microsoft bug and it occurs because a form may not be correctly disposed. It usually happens for a web application and only in the Visual Studio .NET development environment. Restarting IIS solves the problem. Please install the latest patch for .NET Framework. This may fix your problem.

Tue May 06, 2008 3:16 am
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