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Merge pull request #2051 from syncfusion-content/881697-DeleteRows-Performance
881697 - Add FAQ to resolve performance issue while deleting large number of rows
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‎File-Formats-toc.html‎

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<li><a href="/file-formats/xlsio/faqs/how-to-find-and-replace-text-in-hyperlinks">How to find and replace text in hyperlinks</a></li>
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<li><a href="/file-formats/xlsio/faqs/how-to-fix-the-argument-out-of-range-exception-when-accessing-a-large-number-of-rows-and-columns">How to fix the ArgumentOutOfRangeException when accessing a large number of rows and columns?</a></li>
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<li><a href="/file-formats/xlsio/faqs/how-to-set-logarithmic-axis-for-chart-in-excel-document">How to set Logarithmic axis for chart in Excel document?</a></li>
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<li><a href="/file-formats/xlsio/faqs/how-to-resolve-performance-issue-when-deleting-a-large-number-of-rows">How to resolve performance issue when deleting a large number of rows?</a></li>
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</li>
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‎File-Formats/XlsIO/FAQ.md‎

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* [Why cone chart shows itself as column or bar chart?](faqs/why-cone-chart-shows-itself-as-colum-or-bar-chart)
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* [How to vary colors by point for line and column chart?](faqs/how-to-vary-colors-by-point-for-line-and-column-chart)
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* [How to upload a file to Azure blob and download as stream?](faqs/how-to-upload-a-file-to-azure-blob-and-download-as-stream)
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* [How to find and replace text in hyperlinks](faqs/how-to-find-and-replace-text-in-hyperlinks)
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* [How to find and replace text in hyperlinks?](faqs/how-to-find-and-replace-text-in-hyperlinks)
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* [How to fix the ArgumentOutOfRangeException when accessing a large number of rows and columns?](faqs/how-to-fix-the-argument-out-of-range-exception-when-accessing-a-large-number-of-rows-and-columns)
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* [How to set Logarithmic axis for chart in Excel document](faqs/how-to-set-logarithmic-axis-for-chart-in-excel-document)
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* [How to set Logarithmic axis for chart in Excel document?](faqs/how-to-set-logarithmic-axis-for-chart-in-excel-document)
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* [How to resolve performance issue when deleting a large number of rows?](faqs/how-to-resolve-performance-issue-when-deleting-a-large-number-of-rows)

‎File-Formats/XlsIO/faqs/how-to-resolve-performance-issue-when-deleting-a-large-number-of-rows.md‎

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---
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title: Resolve performance issue while deleting |Syncfusion.
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description: This page explains how to resolve performance issue when deleting a large number of rows using Syncfusion .NET Excel library (XlsIO).
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platform: file-formats
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control: XlsIO
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documentation: UG
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---
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# How to resolve performance issue when deleting a large number of rows?
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To address the performance issue, rather than deleting the large number of blank rows using the DeleteRow method, copy the row containing values to a new worksheet and then delete the previous worksheet.
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The following code illustrates how to resolve performance issue when deleting a large number of rows.
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{% tabs %}
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{% highlight c# tabtitle="C# [Cross-platform]" %}
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using(ExcelEngine excelEngine = new ExcelEngine())
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{
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IApplication application = excelEngine.Excel;
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application.DefaultVersion = ExcelVersion.Xlsx;
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//Loads an existing file
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FileStream fileStream = new FileStream("InputTemplate.xlsx", FileMode.Open, FileAccess.Read);
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IWorkbook workbook = application.Workbooks.Open(fileStream);
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IWorksheet worksheet = workbook.Worksheets[0];
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IWorksheet newWorksheet = workbook.Worksheets[1];
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IRange usedRange = worksheet.UsedRange;
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int rowIndexSheet1 = 1;
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int rowIndexSheet2 = 1;
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foreach (IRange row in usedRange.Rows)
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{
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RowStorage rowStorage = WorksheetHelper.GetOrCreateRow(worksheet as IInternalWorksheet, rowIndexSheet1 - 1, false);
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if (rowStorage != null)
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{
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// Copy the Entire row to the next sheet
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IRange destinationRow = newWorksheet.Range[rowIndexSheet2, 1];
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row.EntireRow.CopyTo(destinationRow);
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rowIndexSheet2++;
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}
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rowIndexSheet1++;
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}
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//Remove the worksheet
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workbook.Worksheets[0].Remove();
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//Saving the workbook as stream
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FileStream stream = new FileStream("Output.xlsx", FileMode.Create, FileAccess.ReadWrite);
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workbook.SaveAs(stream);
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stream.Dispose();
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}
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{% endhighlight %}
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{% highlight c# tabtitle="C# [Windows-specific]" %}
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using(ExcelEngine excelEngine = new ExcelEngine())
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{
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IApplication application = excelEngine.Excel;
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application.DefaultVersion = ExcelVersion.Xlsx;
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//Loads an existing file
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IWorkbook workbook = application.Workbooks.Open("InputTemplate.xlsx");
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IWorksheet worksheet = workbook.Worksheets[0];
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IWorksheet newWorksheet = workbook.Worksheets[1];
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IRange usedRange = worksheet.UsedRange;
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int rowIndexSheet1 = 1;
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int rowIndexSheet2 = 1;
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foreach (IRange row in usedRange.Rows)
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{
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RowStorage rowStorage = WorksheetHelper.GetOrCreateRow(worksheet as IInternalWorksheet, rowIndexSheet1 - 1, false);
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if (rowStorage != null)
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{
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// Copy the Entire row to the next sheet
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IRange destinationRow = newWorksheet.Range[rowIndexSheet2, 1];
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row.EntireRow.CopyTo(destinationRow);
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rowIndexSheet2++;
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}
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rowIndexSheet1++;
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}
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//Remove the worksheet
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workbook.Worksheets[0].Remove();
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//Saving the workbook as stream
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workbook.SaveAs("Output.xlsx");
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}
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{% endhighlight %}
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{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
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Using excelEngine As New ExcelEngine()
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Dim application As IApplication = excelEngine.Excel
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application.DefaultVersion = ExcelVersion.Xlsx
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' Loads an existing file
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Dim workbook As IWorkbook = application.Workbooks.Open("InputTemplate.xlsx")
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Dim worksheet As IWorksheet = workbook.Worksheets(0)
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Dim newWorksheet As IWorksheet = workbook.Worksheets(1)
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Dim usedRange As IRange = worksheet.UsedRange
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Dim rowIndexSheet1 As Integer = 1
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Dim rowIndexSheet2 As Integer = 1
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For Each row As IRange In usedRange.Rows
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Dim rowStorage As RowStorage = WorksheetHelper.GetOrCreateRow(TryCast(worksheet, IInternalWorksheet), rowIndexSheet1 - 1, False)
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If rowStorage IsNot Nothing Then
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' Copy the Entire row to the next sheet
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Dim destinationRow As IRange = newWorksheet.Range(rowIndexSheet2, 1)
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row.EntireRow.CopyTo(destinationRow)
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rowIndexSheet2 += 1
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End If
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rowIndexSheet1 += 1
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Next
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' Remove the worksheet
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workbook.Worksheets(0).Remove()
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' Saving the workbook
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workbook.SaveAs("Output.xlsx")
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End Using
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{% endhighlight %}
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{% endtabs %}

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