After I create the zip file using this code.
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Using zip = New ZipFile()\r\n\r\nFor Each row As GridDataItem In RadGridDocs.MasterTableView.Items\r\n\r\nDim clientSelectColumn As CheckBox = DirectCast(row("ClientSelectColumn").Controls(0), CheckBox)\r\n\r\nDim chkBox = clientSelectColumn.Checked\r\n\r\nIf chkBox = "True" Then\r\n\r\nDim txtDocument As TextBox = row.FindControl("txtDocumentFileName")\r\nDim fileName As String = txtDocument.Text\r\n\r\nDim txtDocumentPath As TextBox = row.FindControl("txtDocumentPath")\r\nDim documentPath As String = txtDocumentPath.Text\r\n\r\nDim fullpath As String = Server.MapPath("~") + "\\" + documentPath + fileName\r\n\r\nfullpath = Replace(fullpath, "/", "\\")\r\n\r\nfullpath = Replace(fullpath, "\\", "\\\\")\r\n\r\n'Code to Zip a Folder.\r\n\r\nzip.AddFile(fullpath)\r\n\r\nEnd If\r\n\r\nNext\r\n\r\nzip.Save(Response.OutputStream)\r\n\r\nEnd Using\r\n\r\n
That error indicates that the thing you are trying to read is not a valid zip file. Usually this means a truncated file, or a file with extra rubbish in it, after the valid zip bytes. Either is possible with ASPNET.
\r\nThe most common case in my experience is rubbish after the valid zip data. After you call Zip.Save(Response.OutputStream), you need to call Response.End() in order to terminate the ASPNET response, flush the output stream, and transmit the file and only the zip file, to the browser. did you do that? If your app does not do that, it can result in rubbish in the downloaded (transmitted) zip file.
\r\nIf you want to look more closely into the problem, you can hook up Fiddler2 to see the HTTP transaction. Or, open the resulting downloaded zipfile itself in an editor that supports editing binary files, like emacs. If you see rubbish HTML codes either in the top of the file or the bottom of the zip file, then you probably have a buffer problem on the Response.OutputStream. You need to clear the buffer and reset the mimetype before writing anything, and call Response.End() after ZipFile.Save(Response.OutputStream) . Complicating matters is that I Released a faulty example a looong time ago that did not call Response.End() as it needed to, and it has been re-used in lots of places. You may have been following a bad example.
\r\nThe problem is not in the code you are showing above. It is in code that runs before that, or after that.
", "PostedDate": "2011-08-24T15:04:38.977-07:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "663197", "ThreadId": "270266", "Html": "Thanks,That error indicates that the thing you are trying to read is not a valid zip file. Usually this means a truncated file, or a file with extra rubbish in it, after the valid zip bytes. Either is possible with ASPNET.\r\n
\r\nThe most common case in my experience is rubbish after the valid zip data. After you call Zip.Save(Response.OutputStream), you need to call Response.End() in order to terminate the ASPNET response, flush the output stream, and\r\n transmit the file and only the zip file, to the browser. did you do that? If your app does not do that, it can result in rubbish in the downloaded (transmitted) zip file.\r\n
\r\nIf you want to look more closely into the problem, you can hook up Fiddler2 to see the HTTP transaction. Or, open the resulting downloaded zipfile itself in an editor that supports editing binary files, like emacs. If you see\r\n rubbish HTML codes either in the top of the file or the bottom of the zip file, then you probably have a buffer problem on the Response.OutputStream. You need to clear the buffer and reset the mimetype before writing anything, and call Response.End() after\r\n ZipFile.Save(Response.OutputStream) . Complicating matters is that I Released a faulty example a looong time ago that did not call Response.End() as it needed to, and it has been re-used in lots of places. You may have been following a bad example.\r\n
\r\nThe problem is not in the code you are showing above. It is in code that runs before that, or after that.\r\n
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