881697 - Add FAQ to resolve performance issue while deleting large number of rows

File-Formats-toc.html

@@ -1687,6 +1687,7 @@
 					<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>
 					<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>
 					<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>
+					<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>
                 </ul>
 			</li>
         </ul>

File-Formats/XlsIO/FAQ.md

@@ -79,6 +79,7 @@ The frequently asked questions in Essential XlsIO are listed below.
 * [Why cone chart shows itself as column or bar chart?](faqs/why-cone-chart-shows-itself-as-colum-or-bar-chart)
 * [How to vary colors by point for line and column chart?](faqs/how-to-vary-colors-by-point-for-line-and-column-chart)
 * [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)
-* [How to find and replace text in hyperlinks](faqs/how-to-find-and-replace-text-in-hyperlinks)
+* [How to find and replace text in hyperlinks?](faqs/how-to-find-and-replace-text-in-hyperlinks)
 * [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)
-* [How to set Logarithmic axis for chart in Excel document](faqs/how-to-set-logarithmic-axis-for-chart-in-excel-document)
+* [How to set Logarithmic axis for chart in Excel document?](faqs/how-to-set-logarithmic-axis-for-chart-in-excel-document)
+* [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

@@ -0,0 +1,120 @@
+---
+title: Resolve performance issue while deleting |Syncfusion.
+description: This page explains how to resolve performance issue when deleting a large number of rows using Syncfusion .NET Excel library (XlsIO).
+platform: file-formats
+control: XlsIO
+documentation: UG
+---
+
+# How to resolve performance issue when deleting a large number of rows?
+
+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.
+
+The following code illustrates how to resolve performance issue when deleting a large number of rows.
+
+{% tabs %}
+{% highlight c# tabtitle="C# [Cross-platform]" %}
+using(ExcelEngine excelEngine = new ExcelEngine())
+{
+    IApplication application = excelEngine.Excel;
+    application.DefaultVersion = ExcelVersion.Xlsx;
+
+    //Loads an existing file
+    FileStream fileStream = new FileStream("InputTemplate.xlsx", FileMode.Open, FileAccess.Read);
+    IWorkbook workbook = application.Workbooks.Open(fileStream);
+    IWorksheet worksheet = workbook.Worksheets[0];
+    IWorksheet newWorksheet = workbook.Worksheets[1];
+
+    IRange usedRange = worksheet.UsedRange;
+    int rowIndexSheet1 = 1;
+    int rowIndexSheet2 = 1;
+    foreach (IRange row in  usedRange.Rows)
+    {
+        RowStorage rowStorage = WorksheetHelper.GetOrCreateRow(worksheet as IInternalWorksheet, rowIndexSheet1 - 1, false);
+        if (rowStorage != null)
+        {
+            // Copy the Entire row to the next sheet
+            IRange destinationRow = newWorksheet.Range[rowIndexSheet2, 1];
+            row.EntireRow.CopyTo(destinationRow);
+            rowIndexSheet2++;
+        }
+        rowIndexSheet1++;
+    }
+
+    //Remove the worksheet
+    workbook.Worksheets[0].Remove();
+
+    //Saving the workbook as stream
+    FileStream stream = new FileStream("Output.xlsx", FileMode.Create, FileAccess.ReadWrite);
+    workbook.SaveAs(stream);
+    stream.Dispose();
+}
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %}
+using(ExcelEngine excelEngine = new ExcelEngine())
+{
+    IApplication application = excelEngine.Excel;
+    application.DefaultVersion = ExcelVersion.Xlsx;
+
+    //Loads an existing file
+    IWorkbook workbook = application.Workbooks.Open("InputTemplate.xlsx");
+    IWorksheet worksheet = workbook.Worksheets[0];
+    IWorksheet newWorksheet = workbook.Worksheets[1];
+
+    IRange usedRange = worksheet.UsedRange;
+    int rowIndexSheet1 = 1;
+    int rowIndexSheet2 = 1;
+    foreach (IRange row in  usedRange.Rows)
+    {
+        RowStorage rowStorage = WorksheetHelper.GetOrCreateRow(worksheet as IInternalWorksheet, rowIndexSheet1 - 1, false);
+        if (rowStorage != null)
+        {
+            // Copy the Entire row to the next sheet
+            IRange destinationRow = newWorksheet.Range[rowIndexSheet2, 1];
+            row.EntireRow.CopyTo(destinationRow);
+            rowIndexSheet2++;
+        }
+        rowIndexSheet1++;
+    }
+
+    //Remove the worksheet
+    workbook.Worksheets[0].Remove();
+
+    //Saving the workbook as stream
+    workbook.SaveAs("Output.xlsx");
+}
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+Using excelEngine As New ExcelEngine()
+    Dim application As IApplication = excelEngine.Excel
+    application.DefaultVersion = ExcelVersion.Xlsx
+
+    ' Loads an existing file
+    Dim workbook As IWorkbook = application.Workbooks.Open("InputTemplate.xlsx")
+    Dim worksheet As IWorksheet = workbook.Worksheets(0)
+    Dim newWorksheet As IWorksheet = workbook.Worksheets(1)
+
+    Dim usedRange As IRange = worksheet.UsedRange
+    Dim rowIndexSheet1 As Integer = 1
+    Dim rowIndexSheet2 As Integer = 1
+    For Each row As IRange In usedRange.Rows
+        Dim rowStorage As RowStorage = WorksheetHelper.GetOrCreateRow(TryCast(worksheet, IInternalWorksheet), rowIndexSheet1 - 1, False)
+        If rowStorage IsNot Nothing Then
+            ' Copy the Entire row to the next sheet
+            Dim destinationRow As IRange = newWorksheet.Range(rowIndexSheet2, 1)
+            row.EntireRow.CopyTo(destinationRow)
+            rowIndexSheet2 += 1
+        End If
+        rowIndexSheet1 += 1
+    Next
+
+    ' Remove the worksheet
+    workbook.Worksheets(0).Remove()
+
+    ' Saving the workbook
+    workbook.SaveAs("Output.xlsx")
+End Using
+{% endhighlight %}
+{% endtabs %}