UG documentation 1005966: FAQ for how to find the last row of a particular column in a Excel file using XlsIO?

Document-Processing-toc.html

@@ -6805,6 +6805,9 @@
                   <li>
 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-merge-cells-preserving-topleft-value-and-format-in-xlsio">How to merge cells preserving topleft value and format in XlsIO?</a>
 									</li>
+									<li>
+										<a href="/document-processing/excel/excel-library/net/faqs/how-to-get-the-last-row-of-a-column-using-xlsio-in-excel">How to get the last row of a column using XlsIO in Excel?</a>
+									</li>
 								</ul>
 							</li>
 						</ul>

Document-Processing/Excel/Excel-Library/NET/faqs/how-to-get-the-last-row-of-a-column-using-xlsio-in-excel.md

@@ -0,0 +1,164 @@
+---
+title: Last row of a column in Excel file using XlsIO | Syncfusion
+description: This FAQ explains how to find the last row with data in a specific column of an Excel worksheet using Syncfusion XlsIO and retrieve used range boundaries.
+platform: document-processing
+control: XlsIO
+documentation: UG
+---
+
+# How to get the last row of a column using XlsIO in Excel?
+
+Finding the last row of a specific column helps you determine the exact extent of data in that column. XlsIO provides access to the worksheet's used range through the [IWorksheet.UsedRange](https://help.syncfusion.com/cr/document-processing/Syncfusion.XlsIO.IWorksheet.html) property, which you can use to iterate backward through rows and identify cells with data in a particular column.
+
+The following code example illustrates how to find the last row containing data in a specific column.
+
+{% tabs %}  
+{% highlight c# tabtitle="C# [Cross-platform]" %}
+using (ExcelEngine excelEngine = new ExcelEngine())
+{
+    // Create an instance of ExcelEngine
+    IApplication application = excelEngine.Excel;
+    IWorkbook workbook = application.Workbooks.Create(1);
+
+    // Access the first worksheet in the workbook
+    IWorksheet sheet = workbook.Worksheets[0];
+
+    // Populate data in specific ranges to demonstrate last row detection
+    sheet["A1:B10"].Text = "10";
+    sheet["C1:C5"].Text = "20";
+
+    // Find the last row in column C (column index 3)
+    int lastRow = GetLastRow(3, sheet as WorksheetImpl);
+    Console.WriteLine("Last Row in Column C: " + lastRow);
+
+    // Save the workbook to the specified output path
+    workbook.SaveAs(Path.GetFullPath("Output/Output.xlsx"));
+}
+
+// Helper method to find the last row containing data in a specified column
+private static int GetLastRow(int column, WorksheetImpl worksheet)
+{
+    // Get the starting and ending row indices of the used range
+    int firstRow = worksheet.UsedRange.Row;
+    int lastRow = worksheet.UsedRange.LastRow;
+
+    // Iterate backward through rows to find the last cell with data in the column
+    for (int iRow = lastRow; iRow >= firstRow; iRow--)
+    {
+        // Get or create the row storage for the current row
+        RowStorage rowStorage = WorksheetHelper.GetOrCreateRow(worksheet, iRow - 1, false);
+        if (rowStorage != null)
+        {
+            // Enumerate through cells in the row to check for data in the target column
+            RowStorageEnumerator enumerator = rowStorage.GetEnumerator(worksheet.RecordExtractor) as RowStorageEnumerator;
+            while (enumerator.MoveNext())
+            {
+                // Return the row number when the column is found
+                if (enumerator.ColumnIndex + 1 == column)
+                    return iRow;
+            }
+        }
+    }
+    return -1;
+}
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %}
+using (ExcelEngine excelEngine = new ExcelEngine())
+{
+    // Create an instance of ExcelEngine
+    IApplication application = excelEngine.Excel;
+    IWorkbook workbook = application.Workbooks.Create(1);
+
+    // Access the first worksheet in the workbook
+    IWorksheet sheet = workbook.Worksheets[0];
+
+    // Populate data in specific ranges to demonstrate last row detection
+    sheet["A1:B10"].Text = "10";
+    sheet["C1:C5"].Text = "20";
+
+    // Find the last row in column C (column index 3)
+    int lastRow = GetLastRow(3, sheet as WorksheetImpl);
+    Console.WriteLine("Last Row in Column C: " + lastRow);
+
+    // Save the workbook to the specified output path
+    workbook.SaveAs("Output.xlsx");
+}
+
+// Helper method to find the last row containing data in a specified column
+private static int GetLastRow(int column, WorksheetImpl worksheet)
+{
+    // Get the starting and ending row indices of the used range
+    int firstRow = worksheet.UsedRange.Row;
+    int lastRow = worksheet.UsedRange.LastRow;
+
+    // Iterate backward through rows to find the last cell with data in the column
+    for (int iRow = lastRow; iRow >= firstRow; iRow--)
+    {
+        // Get or create the row storage for the current row
+        RowStorage rowStorage = WorksheetHelper.GetOrCreateRow(worksheet, iRow - 1, false);
+        if (rowStorage != null)
+        {
+            // Enumerate through cells in the row to check for data in the target column
+            RowStorageEnumerator enumerator = rowStorage.GetEnumerator(worksheet.RecordExtractor) as RowStorageEnumerator;
+            while (enumerator.MoveNext())
+            {
+                // Return the row number when the column is found
+                if (enumerator.ColumnIndex + 1 == column)
+                    return iRow;
+            }
+        }
+    }
+    return -1;
+}
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+Sub Main(args As String())
+    Using excelEngine As New ExcelEngine()
+        ' Create an instance of ExcelEngine
+        Dim application As IApplication = excelEngine.Excel
+        Dim workbook As IWorkbook = application.Workbooks.Create(1)
+
+        ' Access the first worksheet in the workbook
+        Dim sheet As IWorksheet = workbook.Worksheets(0)
+
+        ' Populate data in specific ranges to demonstrate last row detection
+        sheet("A1:B10").Text = "10"
+        sheet("C1:C5").Text = "20"
+
+        ' Find the last row in column C (column index 3)
+        Dim lastRow As Integer = GetLastRow(3, TryCast(sheet, WorksheetImpl))
+        Console.WriteLine("Last Row in Column C: " & lastRow)
+
+        ' Save the workbook to the specified output path
+        workbook.SaveAs("Output.xlsx")
+    End Using
+End Sub
+' Helper method to find the last row containing data in a specified column
+Private Function GetLastRow(column As Integer, worksheet As WorksheetImpl) As Integer
+    ' Get the starting and ending row indices of the used range
+    Dim firstRow As Integer = worksheet.UsedRange.Row
+    Dim lastRow As Integer = worksheet.UsedRange.LastRow
+
+    ' Iterate backward through rows to find the last cell with data in the column
+    For iRow As Integer = lastRow To firstRow Step -1
+        ' Get or create the row storage for the current row
+        Dim rowStorage As RowStorage = WorksheetHelper.GetOrCreateRow(worksheet, iRow - 1, False)
+        If rowStorage IsNot Nothing Then
+            ' Enumerate through cells in the row to check for data in the target column
+            Dim enumerator As RowStorageEnumerator = TryCast(rowStorage.GetEnumerator(worksheet.RecordExtractor), RowStorageEnumerator)
+            While enumerator.MoveNext()
+                ' Return the row number when the column is found
+                If enumerator.ColumnIndex + 1 = column Then
+                    Return iRow
+                End If
+            End While
+        End If
+    Next
+    Return -1
+End Function
+{% endhighlight %}
+{% endtabs %}
+
+A complete working example in C# is present on <a href="https://github.com/SyncfusionExamples/XlsIO-Examples/tree/1005966-Last-Row/FAQ/Last%20Row/.NET/Last%20Row">this GitHub page</a>.