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Copy file name to clipboardExpand all lines: Document-Processing/Excel/Excel-Library/NET/faqs/how-to-avoid-exception-when-adding-worksheets-with-same-name.md
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# How to avoid exception when adding worksheets with same name?
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Microsoft Excel throws exception when adding worksheet with existing worksheet name in a workbook and XlsIO does the same. But in some case, if you want to add worksheets with the same name using XlsIO then you can avoid the exception in XlsIO by setting [IgnoreSheetNameException](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IApplication.html#Syncfusion_XlsIO_IApplication_IgnoreSheetNameException) property of [IApplication](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IApplication.html) as true.
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Microsoft Excel throws exception when adding worksheet with existing worksheet name in a workbook and XlsIO does the same. But in some case, if you want to add worksheets with the same name using XlsIO then you can avoid the exception in XlsIO by setting [IgnoreSheetNameException](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IApplication.html#Syncfusion_XlsIO_IApplication_IgnoreSheetNameException) property of [IApplication](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IApplication.html) as true.
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The following code snippet shows how to add two worksheets with same name in a workbook.
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## See Also
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*[How to overcome UnauthorizedAccessException?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-overcome-unauthorizedaccessexception)
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*[How to overcome StackOverflow exception with IWorksheet Calculate()?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-overcome-stackoverflow-exception-with-iworksheet-calculate)
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*[What are the known exceptions of XlsIO?](https://help.syncfusion.com/file-formats/xlsio/known-exceptions)
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*[How to create a named range in Excel?](https://help.syncfusion.com/file-formats/xlsio/migrate-from-office-automation-to-syncfusion-xlsio/create-named-range-in-excel)
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*[How to use Named Ranges with XlsIO?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-use-named-ranges-with-xlsio)
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*[How to overcome UnauthorizedAccessException?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-overcome-unauthorizedaccessexception)
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*[How to overcome StackOverflow exception with IWorksheet Calculate()?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-overcome-stackoverflow-exception-with-iworksheet-calculate)
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*[What are the known exceptions of XlsIO?](https://help.syncfusion.com/document-processing/excel/excel-library/net/known-exceptions)
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*[How to create a named range in Excel?](https://help.syncfusion.com/document-processing/excel/excel-library/net/migrate-from-office-automation-to-syncfusion-xlsio/create-named-range-in-excel)
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*[How to use Named Ranges with XlsIO?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-use-named-ranges-with-xlsio)
Copy file name to clipboardExpand all lines: Document-Processing/Excel/Excel-Library/NET/faqs/how-to-convert-hidden-worksheets-alone-to-image.md
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# How to convert hidden worksheets alone to image?
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Worksheet hiding and unhiding can be achieved easily through [Visibility](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.ITabSheet.html#Syncfusion_XlsIO_ITabSheet_Visibility) property of [IWorksheet](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IWorksheet.html) interface. Essential® XlsIO also supports strong hidden, which makes the worksheet very hidden and cannot be unhidden easily. To know more about strong hidden, please see [documentation](https://www.syncfusion.com/kb/4878/how-to-set-worksheet-visibility-to-very-hidden).
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Worksheet hiding and unhiding can be achieved easily through [Visibility](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.ITabSheet.html#Syncfusion_XlsIO_ITabSheet_Visibility) property of [IWorksheet](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.WorksheetVisibility.html) interface. Essential® XlsIO also supports strong hidden, which makes the worksheet very hidden and cannot be unhidden easily. To know more about strong hidden, please see [documentation](https://www.syncfusion.com/kb/4878/how-to-set-worksheet-visibility-to-very-hidden).
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Conversion of only hidden worksheets to image can be achieved using condition check for worksheet visibility. The following complete code example illustrates how to convert hidden worksheets alone to image.
Copy file name to clipboardExpand all lines: Document-Processing/Excel/Excel-Library/NET/faqs/how-to-hide-the-summary-rows-and-columns-using-xlsio.md
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# How to hide the summary rows and columns using XlsIO?
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You can hide the summary rows and columns by using the [IsSummaryRowBelow](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IPageSetup.html#Syncfusion_XlsIO_IPageSetup_IsSummaryRowBelow) and [IsSummaryColumnRight](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IPageSetup.html#Syncfusion_XlsIO_IPageSetup_IsSummaryColumnRight) properties. The following code snippet illustrates this.
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You can hide the summary rows and columns by using the [IsSummaryRowBelow](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IPageSetup.html#Syncfusion_XlsIO_IPageSetup_IsSummaryRowBelow) and [IsSummaryColumnRight](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IPageSetup.html#Syncfusion_XlsIO_IPageSetup_IsSummaryColumnRight) properties. The following code snippet illustrates this.
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{% tabs %}
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{% highlight c# tabtitle="C# [Cross-platform]" %}
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## See Also
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*[What is the maximum range of Rows and Columns?](https://help.syncfusion.com/file-formats/xlsio/faqs/what-is-the-maximum-range-of-rows-and-columns)
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*[How to unfreeze the rows and columns in XlsIO?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-unfreeze-the-rows-and-columns-in-xlsio)
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*[How to sort two or more columns in a pivot table?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-sort-two-or-more-columns-in-a-pivot-table)
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*[How to hide Excel worksheets?](https://help.syncfusion.com/file-formats/xlsio/migrate-from-office-automation-to-syncfusion-xlsio/hide-excel-worksheets)
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*[How to show or hide rows and columns?](https://help.syncfusion.com/file-formats/xlsio/worksheet-rows-and-columns-manipulation#show-or-hide-rows-and-columns)
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*[How to show or hide specific range?](https://help.syncfusion.com/file-formats/xlsio/worksheet-rows-and-columns-manipulation#show-or-hide-specific-range)
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*[What is the maximum range of Rows and Columns?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/what-is-the-maximum-range-of-rows-and-columns)
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*[How to unfreeze the rows and columns in XlsIO?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-unfreeze-the-rows-and-columns-in-xlsio)
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*[How to sort two or more columns in a pivot table?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-sort-two-or-more-columns-in-a-pivot-table)
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*[How to hide Excel worksheets?](https://help.syncfusion.com/document-processing/excel/excel-library/net/migrate-from-office-automation-to-syncfusion-xlsio/hide-excel-worksheets)
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*[How to show or hide rows and columns?](https://help.syncfusion.com/document-processing/excel/excel-library/net/worksheet-rows-and-columns-manipulation#show-or-hide-rows-and-columns)
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*[How to show or hide specific range?](https://help.syncfusion.com/document-processing/excel/excel-library/net/worksheet-rows-and-columns-manipulation#show-or-hide-specific-range)
Copy file name to clipboardExpand all lines: Document-Processing/Excel/Excel-Library/NET/faqs/how-to-open-an-excel-2013-macro-enabled-template.md
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## See Also
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*[How to check whether an Excel document contains macro?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-check-whether-an-excel-document-contains-macro)
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*[Does XlsIO support Excel files with macros that are digitally signed?](https://help.syncfusion.com/file-formats/xlsio/faqs/does-xlsio-support-excel-files-with-macros-that-are-digitally-signed)
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*[Does XlsIO support password protected macro in the Excel documents?](https://help.syncfusion.com/file-formats/xlsio/faqs/does-xlsio-support-password-protected-macro-in-the-excel-documents)
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*[How to create a macro?](https://help.syncfusion.com/file-formats/xlsio/working-with-macros#creating-a-macro)
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*[How to edit a macro?](https://help.syncfusion.com/file-formats/xlsio/working-with-macros#editing-a-macro)
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*[How to remove macros?](https://help.syncfusion.com/file-formats/xlsio/working-with-macros#removing-macros)
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*[How to check whether an Excel document contains macro?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-check-whether-an-excel-document-contains-macro)
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*[Does XlsIO support Excel files with macros that are digitally signed?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/does-xlsio-support-excel-files-with-macros-that-are-digitally-signed)
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*[Does XlsIO support password protected macro in the Excel documents?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/does-xlsio-support-password-protected-macro-in-the-excel-documents)
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*[How to create a macro?](https://help.syncfusion.com/document-processing/excel/excel-library/net/working-with-macros#creating-a-macroo)
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*[How to edit a macro?](https://help.syncfusion.com/document-processing/excel/excel-library/net/working-with-macros#editing-a-macro)
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*[How to remove macros?](https://help.syncfusion.com/document-processing/excel/excel-library/net/working-with-macros#removing-macros)
Copy file name to clipboardExpand all lines: Document-Processing/Excel/Excel-Library/NET/faqs/how-to-open-an-excel-file-from-stream.md
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## See Also
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*[How to open an Excel 2013 Macro Enabled Template?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-open-an-excel-2013-macro-enabled-template)
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*[How to create and open Excel Template files by using XlsIO?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-create-and-open-excel-template-files-by-using-xlsio)
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*[How to open an existing workbook from stream?](https://help.syncfusion.com/file-formats/xlsio/loading-and-saving-workbook#opening-an-existing-workbook-from-stream)
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*[How to open a CSV file?](https://help.syncfusion.com/file-formats/xlsio/working-with-excel-worksheet#open-a-csv-file)
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*[How to open an existing XLSX workbook and save it as XLS?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-open-an-existing-xlsx-workbook-and-save-it-as-xls)
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*[How to resolve the File does not contain workbook stream error in Syncfusion.XlsIO.Base.dll?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-resolve-the-file-does-not-contain-workbook-stream-error)
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*[How to resolve Excel cannot open the file filename.xlsx... error?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-resolve-excel-cannot-open-the-file-because-the-file-format-for-the-file-extension-is-not-valid)
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*[How to save a file to stream?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-save-a-file-to-stream)
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*[How to merge excel files from more than one workbook to a single file?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-merge-excel-files-from-more-than-one-workbook-to-a-single-file)
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*[Does XlsIO support Excel files with macros that are digitally signed?](https://help.syncfusion.com/file-formats/xlsio/faqs/does-xlsio-support-excel-files-with-macros-that-are-digitally-signed)
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*[How does Excel file with uninstalled fonts is converted to PDF/Image?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-does-excel-file-with-uninstalled-fonts-is-converted-to-pdf-image)
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*[How to open an Excel 2013 Macro Enabled Template?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-open-an-excel-2013-macro-enabled-template)
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*[How to create and open Excel Template files by using XlsIO?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-create-and-open-excel-template-files-by-using-xlsio)
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*[How to open an existing workbook from stream?](https://help.syncfusion.com/document-processing/excel/excel-library/net/loading-and-saving-workbook#opening-an-existing-workbook-from-stream)
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*[How to open a CSV file?](https://help.syncfusion.com/document-processing/excel/excel-library/net/working-with-excel-worksheet#open-a-csv-file)
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*[How to open an existing XLSX workbook and save it as XLS?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-open-an-existing-xlsx-workbook-and-save-it-as-xls)
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*[How to resolve the File does not contain workbook stream error in Syncfusion.XlsIO.Base.dll?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-resolve-the-file-does-not-contain-workbook-stream-error)
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*[How to resolve Excel cannot open the file filename.xlsx... error?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-resolve-excel-cannot-open-the-file-because-the-file-format-for-the-file-extension-is-not-valid)
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*[How to save a file to stream?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-save-a-file-to-stream)
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*[How to merge excel files from more than one workbook to a single file?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-merge-excel-files-from-more-than-one-workbook-to-a-single-file)
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*[Does XlsIO support Excel files with macros that are digitally signed?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/does-xlsio-support-excel-files-with-macros-that-are-digitally-signed)
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*[How does Excel file with uninstalled fonts is converted to PDF/Image?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-does-excel-file-with-uninstalled-fonts-is-converted-to-pdf-image)
Copy file name to clipboardExpand all lines: Document-Processing/Excel/Excel-Library/NET/faqs/how-to-overcome-stackoverflow-exception-with-iworksheet-calculate.md
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# How to overcome StackOverflow exception with IWorksheet's Calculate()?
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StackOverflow exception occurs when the number of **IterationMaxCount**, **MaximumRecursiveCalls** and **MaxStackDepth** exceeds in the [CalcEngine](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IWorksheet.html#Syncfusion_XlsIO_IWorksheet_CalcEngine). To avoid this StackOverflow exception while computing the formulas iteratively exceeding the maximum capacity, you need to set the values for these properties before calling the [Calculate](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IWorksheet.html#Syncfusion_XlsIO_IWorksheet_Calculate) method of [IWorksheet](https://help.syncfusion.com/cr/file-formats/Syncfusion.XlsIO.IWorksheet.html) interface.
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StackOverflow exception occurs when the number of **IterationMaxCount**, **MaximumRecursiveCalls** and **MaxStackDepth** exceeds in the [CalcEngine](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IWorksheet.html#Syncfusion_XlsIO_IWorksheet_CalcEngine). To avoid this StackOverflow exception while computing the formulas iteratively exceeding the maximum capacity, you need to set the values for these properties before calling the [Calculate](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IWorksheet.html#Syncfusion_XlsIO_IWorksheet_Calculate) method of [IWorksheet](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IWorksheet.html) interface.
*[How to overcome UnauthorizedAccessException?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-overcome-unauthorizedaccessexception)
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*[How to avoid exception when adding worksheets with same name?](https://help.syncfusion.com/file-formats/xlsio/faqs/how-to-avoid-exception-when-adding-worksheets-with-same-name)
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*[What are the known exceptions of XlsIO?](https://help.syncfusion.com/file-formats/xlsio/known-exceptions)
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*[What is Calculation Engine?](https://help.syncfusion.com/file-formats/xlsio/working-with-formulas#calculation-engine)
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*[What are Calculate Options?](https://help.syncfusion.com/file-formats/xlsio/working-with-formulas#calculate-options)
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*[How to overcome UnauthorizedAccessException?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-overcome-unauthorizedaccessexception)
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*[How to avoid exception when adding worksheets with same name?](https://help.syncfusion.com/document-processing/excel/excel-library/net/faqs/how-to-avoid-exception-when-adding-worksheets-with-same-name)
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*[What are the known exceptions of XlsIO?](https://help.syncfusion.com/document-processing/excel/excel-library/net/known-exceptions)
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*[What is Calculation Engine?](https://help.syncfusion.com/document-processing/excel/excel-library/net/working-with-formulas#calculation-engine)
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*[What are Calculate Options?](https://help.syncfusion.com/document-processing/excel/excel-library/net/working-with-formulas#calculate-options)
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