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POWhen Excel file is opened externally during C# application, an exception occurs
 

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  1. POWhen Excel file is opened externally during C# application, an exception occurs
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    <p>I wrote a C# application that queries a DB and puts the results in an excel file. The program itself works fine. However if I open a second completely unrelated excel file while the application is running, an exception occurs and the process stops.</p> <p>Now, in the program itself I've set the visibility to false, and after opening the second unrelated Excel file, the one that was being generated is suddenly open and visible, and then I get the exception.</p> <p>Anyone know what is causing the problem or how to resolve it?</p> <p>The relevant parts of the code is as follows, the exception occurs at the line worksheet.get_Range(currCol.GetString() + excelRow, Missing.Value).Formula = item.ToString();</p> <p>The exception itself is : "Exception from HRESULT: 0x800AC472"</p> <pre><code> Application exc = new Application(); //Makes the Excel file not visible exc.Visible = false; exc.UserControl = false; exc.DisplayAlerts = false; Workbooks workbooks = exc.Workbooks; Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet); Sheets sheets = workbook.Worksheets; Worksheet worksheet = (Worksheet)sheets.get_Item(1); int excelRow = 1; ExcelChar currCol = new ExcelChar('A'); System.Data.DataTable testTable = dbConnection.searchQuery("Select * from testTable").Copy(); if (worksheet == null) { Console.WriteLine("ERROR: worksheet == null"); } foreach (System.Data.DataRow row in testTable.Rows) { foreach (var item in row.ItemArray) { worksheet.get_Range(currCol.GetString() + excelRow, Missing.Value).Formula = item.ToString(); currCol.Add(1); } excelRow++; currCol = new ExcelChar('A'); } </code></pre>
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    1. USuser1524520
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      1. USDavid
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    1. CO1. We need to see your code. 2. We need to know what the exception is, and on what line of your code the exception is being thrown.
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      1. USRobert Harvey
    2. CO@user890123480213480128304: This is something that has happened in the past to colleagues of mine. It has something to do with excel being able to open only one instance of itself. Google something along those lines.
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      1. USOnly Bolivian Here
    3. COAre you using threads when opening excel file ?
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      1. USsaber
 

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