Create, read, and edit Excel files in UWP

10 Oct 202224 minutes to read

Syncfusion Excel library for UWP platform can be used to create, read, edit Excel files. This also convert Excel files to PDF.

Create a simple Excel report

The below steps illustrates creating an simple Invoice formatted Excel document in UWP application.

1. Create a new C# Blank App (Universal Windows) project.

1. Install the Syncfusion.XlsIO.UWP NuGet package as reference to your .NET Framework applications from NuGet.org.

1. Add a new button in the MainPage.xaml as shown below.

   XAML

   <Page
       x:Class="GettingStarted_UWP.MainPage"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:local="using:GettingStarted_UWP"
       xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
       mc:Ignorable="d"
       Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
      
       <Grid>
           <Button x:Name="button" Content="Create Document" Click="OnButtonClicked" HorizontalAlignment="Center" VerticalAlignment="Center"/>
       </Grid>
   </Page>

2. Include the following namespaces in the MainPage.xaml.cs file.

   C#

   using Syncfusion.XlsIO;
   using Windows.Storage.Pickers;
   using Windows.Storage;
   using Windows.UI;

   VB.NET

   Imports Syncfusion.XlsIO
   Imports Windows.Storage.Pickers
   Imports Windows.Storage
   Imports Windows.UI

3. Include the below code snippet in the click event of the button in MainPage.xaml.cs, to create an Excel file and save the Excel document as a physical file and open the file for viewing.

   C#

   //Create an instance of ExcelEngine.
   using (ExcelEngine excelEngine = new ExcelEngine())
   {
   	IApplication application = excelEngine.Excel;
      
   	application.DefaultVersion = ExcelVersion.Xlsx;
      
   	//Create a workbook with a worksheet
   	IWorkbook workbook = application.Workbooks.Create(1);
      
   	//Access first worksheet from the workbook instance.
   	IWorksheet worksheet = workbook.Worksheets[0];
      
   	Assembly executingAssembly = typeof(MainPage).GetTypeInfo().Assembly;
   	Stream inputStream = executingAssembly.GetManifestResourceStream("GettingStarted_UWP.AdventureCycles-Logo.png");
      
   	//Add a picture
   	IPictureShape shape = worksheet.Pictures.AddPicture(1, 1, inputStream, 20, 20);
      
   	//Disable gridlines in the worksheet
   	worksheet.IsGridLinesVisible = false;
      
   	//Enter values to the cells from A3 to A5
   	worksheet.Range["A3"].Text = "46036 Michigan Ave";
   	worksheet.Range["A4"].Text = "Canton, USA";
   	worksheet.Range["A5"].Text = "Phone: [phone]";
      
   	//Make the text bold
   	worksheet.Range["A3:A5"].CellStyle.Font.Bold = true;
      
   	//Merge cells
   	worksheet.Range["D1:E1"].Merge();
      
   	//Enter text to the cell D1 and apply formatting.
   	worksheet.Range["D1"].Text = "INVOICE";
   	worksheet.Range["D1"].CellStyle.Font.Bold = true;
   	worksheet.Range["D1"].CellStyle.Font.RGBColor = ColorHelper.FromArgb(0, 42, 118, 189);
   	worksheet.Range["D1"].CellStyle.Font.Size = 35;
      
   	//Apply alignment in the cell D1
   	worksheet.Range["D1"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignRight;
   	worksheet.Range["D1"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop;
      
   	//Enter values to the cells from D5 to E8
   	worksheet.Range["D5"].Text = "INVOICE#";
   	worksheet.Range["E5"].Text = "DATE";
   	worksheet.Range["D6"].Number = 1028;
   	worksheet.Range["E6"].Value = "12/31/2018";
   	worksheet.Range["D7"].Text = "CUSTOMER ID";
   	worksheet.Range["E7"].Text = "TERMS";
   	worksheet.Range["D8"].Number = 564;
   	worksheet.Range["E8"].Text = "Due Upon Receipt";
      
   	//Apply RGB backcolor to the cells from D5 to E8
   	worksheet.Range["D5:E5"].CellStyle.Color = ColorHelper.FromArgb(0, 42, 118, 189);
   	worksheet.Range["D7:E7"].CellStyle.Color = ColorHelper.FromArgb(0, 42, 118, 189);
      
   	//Apply known colors to the text in cells D5 to E8
   	worksheet.Range["D5:E5"].CellStyle.Font.Color = ExcelKnownColors.White;
   	worksheet.Range["D7:E7"].CellStyle.Font.Color = ExcelKnownColors.White;
      
   	//Make the text as bold from D5 to E8
   	worksheet.Range["D5:E8"].CellStyle.Font.Bold = true;
      
   	//Apply alignment to the cells from D5 to E8
   	worksheet.Range["D5:E8"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
   	worksheet.Range["D5:E5"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
   	worksheet.Range["D7:E7"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
   	worksheet.Range["D6:E6"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop;
      
   	//Enter value and applying formatting in the cell A7
   	worksheet.Range["A7"].Text = "  BILL TO";
   	worksheet.Range["A7"].CellStyle.Color = ColorHelper.FromArgb(0, 42, 118, 189);
   	worksheet.Range["A7"].CellStyle.Font.Bold = true;
   	worksheet.Range["A7"].CellStyle.Font.Color = ExcelKnownColors.White;
      
   	//Apply alignment
   	worksheet.Range["A7"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft;
   	worksheet.Range["A7"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
      
   	//Enter values in the cells A8 to A12
   	worksheet.Range["A8"].Text = "Steyn";
   	worksheet.Range["A9"].Text = "Great Lakes Food Market";
   	worksheet.Range["A10"].Text = "20 Whitehall Rd";
   	worksheet.Range["A11"].Text = "North Muskegon,USA";
   	worksheet.Range["A12"].Text = "[phone]";
      
   	//Create a Hyperlink for e-mail in the cell A13
   	IHyperLink hyperlink = worksheet.HyperLinks.Add(worksheet.Range["A13"]);
   	hyperlink.Type = ExcelHyperLinkType.Url;
   	hyperlink.Address = "[e-mail]";
   	hyperlink.ScreenTip = "Send Mail";
      
   	//Enter details of products and prices
   	worksheet.Range["A15"].Text = "  DESCRIPTION";
   	worksheet.Range["C15"].Text = "QTY";
   	worksheet.Range["D15"].Text = "UNIT PRICE";
   	worksheet.Range["E15"].Text = "AMOUNT";
   	worksheet.Range["A16"].Text = "Cabrales Cheese";
   	worksheet.Range["A17"].Text = "Chocos";
   	worksheet.Range["A18"].Text = "Pasta";
   	worksheet.Range["A19"].Text = "Cereals";
   	worksheet.Range["A20"].Text = "Ice Cream";
   	worksheet.Range["C16"].Number = 3;
   	worksheet.Range["C17"].Number = 2;
   	worksheet.Range["C18"].Number = 1;
   	worksheet.Range["C19"].Number = 4;
   	worksheet.Range["C20"].Number = 3;
   	worksheet.Range["D16"].Number = 21;
   	worksheet.Range["D17"].Number = 54;
   	worksheet.Range["D18"].Number = 10;
   	worksheet.Range["D19"].Number = 20;
   	worksheet.Range["D20"].Number = 30;
   	worksheet.Range["D23"].Text = "Total";
      
   	//Apply number format
   	worksheet.Range["D16:E22"].NumberFormat = "$.00";
   	worksheet.Range["E23"].NumberFormat = "$.00";
      
   	//Merge column A and B from row 15 to 22
   	worksheet.Range["A15:B15"].Merge();
   	worksheet.Range["A16:B16"].Merge();
   	worksheet.Range["A17:B17"].Merge();
   	worksheet.Range["A18:B18"].Merge();
   	worksheet.Range["A19:B19"].Merge();
   	worksheet.Range["A20:B20"].Merge();
   	worksheet.Range["A21:B21"].Merge();
   	worksheet.Range["A22:B22"].Merge();
      
   	//Apply incremental formula for column Amount by multiplying Qty and UnitPrice
   	application.EnableIncrementalFormula = true;
   	worksheet.Range["E16:E20"].Formula = "=C16*D16";
      
   	//Formula for Sum the total
   	worksheet.Range["E23"].Formula = "=SUM(E16:E22)";
      
   	//Apply borders
   	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].LineStyle = ExcelLineStyle.Thin;
   	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].LineStyle = ExcelLineStyle.Thin;
   	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].Color = ExcelKnownColors.Grey_25_percent;
   	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].Color = ExcelKnownColors.Grey_25_percent;
   	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].LineStyle = ExcelLineStyle.Thin;
   	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].LineStyle = ExcelLineStyle.Thin;
   	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].Color = ExcelKnownColors.Black;
   	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].Color = ExcelKnownColors.Black;
      
   	//Apply font setting for cells with product details
   	worksheet.Range["A3:E23"].CellStyle.Font.FontName = "Arial";
   	worksheet.Range["A3:E23"].CellStyle.Font.Size = 10;
   	worksheet.Range["A15:E15"].CellStyle.Font.Color = ExcelKnownColors.White;
   	worksheet.Range["A15:E15"].CellStyle.Font.Bold = true;
   	worksheet.Range["D23:E23"].CellStyle.Font.Bold = true;
      
   	//Apply cell color
   	worksheet.Range["A15:E15"].CellStyle.Color = ColorHelper.FromArgb(0, 42, 118, 189);
      
   	//Apply alignment to cells with product details
   	worksheet.Range["A15"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft;
   	worksheet.Range["C15:C22"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
   	worksheet.Range["D15:E15"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
      
   	//Apply row height and column width to look good
   	worksheet.Range["A1"].ColumnWidth = 36;
   	worksheet.Range["B1"].ColumnWidth = 11;
   	worksheet.Range["C1"].ColumnWidth = 8;
   	worksheet.Range["D1:E1"].ColumnWidth = 18;
   	worksheet.Range["A1"].RowHeight = 47;
   	worksheet.Range["A2"].RowHeight = 15;
   	worksheet.Range["A3:A4"].RowHeight = 15;
   	worksheet.Range["A5"].RowHeight = 18;
   	worksheet.Range["A6"].RowHeight = 29;
   	worksheet.Range["A7"].RowHeight = 18;
   	worksheet.Range["A8"].RowHeight = 15;
   	worksheet.Range["A9:A14"].RowHeight = 15;
   	worksheet.Range["A15:A23"].RowHeight = 18;
      
      
   	// Save the Workbook
   	StorageFile storageFile;
   	if (!(Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons")))
   	{
   		FileSavePicker savePicker = new FileSavePicker();
   		savePicker.SuggestedStartLocation = PickerLocationId.Desktop;
   		savePicker.SuggestedFileName = "Output";
   		savePicker.FileTypeChoices.Add("Excel Files", new List<string>() { ".xlsx" });
   		storageFile = await savePicker.PickSaveFileAsync();
   	}
   	else
   	{
   		StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
   		storageFile = await local.CreateFileAsync("Output.xlsx", CreationCollisionOption.ReplaceExisting);
   	}
   	//Saving the workbook
   	await workbook.SaveAsAsync(storageFile);
      
   	// Launch the saved file
   	await Windows.System.Launcher.LaunchFileAsync(storageFile);
   }

   VB.NET

   Private Sub OnButtonClicked(ByVal sender As Object, ByVal args As EventArgs)
   'Create an instance of ExcelEngine
   Using excelEngine As ExcelEngine = New ExcelEngine()
      
   	Dim application As IApplication = excelEngine.Excel
      
   	application.DefaultVersion = ExcelVersion.Xlsx
      
   	'Create a workbook
   	Dim workbook As IWorkbook = application.Workbooks.Create(1)
   	Dim worksheet As IWorksheet = workbook.Worksheets(0)
      
   	'Adding a picture
   	Dim executingAssembly As Assembly = GetType(MainPage).GetTypeInfo().Assembly
   	Dim inputStream As Stream = executingAssembly.GetManifestResourceStream("GettingStarted_UWP.AdventureCycles-Logo.png")
   	Dim shape As IPictureShape = worksheet.Pictures.AddPicture(1, 1, inputStream, 20, 20)
      
   	'Disable gridlines in the worksheet
   	worksheet.IsGridLinesVisible = False
      
   	'Enter values to the cells from A3 to A5
   	worksheet.Range("A3").Text = "46036 Michigan Ave"
   	worksheet.Range("A4").Text = "Canton, USA"
   	worksheet.Range("A5").Text = "Phone: [phone]"
      
   	'Make the text bold
   	worksheet.Range("A3:A5").CellStyle.Font.Bold = True
      
   	'Merge cells
   	worksheet.Range("D1:E1").Merge()
      
   	'Enter text to the cell D1 and apply formatting.
   	worksheet.Range("D1").Text = "INVOICE"
   	worksheet.Range("D1").CellStyle.Font.Bold = True
   	worksheet.Range("D1").CellStyle.Font.RGBColor = ColorHelper.FromArgb(0, 42, 118, 189)
   	worksheet.Range("D1").CellStyle.Font.Size = 35
      
   	'Apply alignment in the cell D1
   	worksheet.Range("D1").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignRight
   	worksheet.Range("D1").CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop
      
   	'Enter values to the cells from D5 to E8
   	worksheet.Range("D5").Text = "INVOICE#"
   	worksheet.Range("E5").Text = "DATE"
   	worksheet.Range("D6").Number = 1028
   	worksheet.Range("E6").Value = "12/31/2018"
   	worksheet.Range("D7").Text = "CUSTOMER ID"
   	worksheet.Range("E7").Text = "TERMS"
   	worksheet.Range("D8").Number = 564
   	worksheet.Range("E8").Text = "Due Upon Receipt"
      
   	'Apply RGB back color to the cells from D5 to E8
   	worksheet.Range("D5:E5").CellStyle.Color = ColorHelper.FromArgb(0, 42, 118, 189)
   	worksheet.Range("D7:E7").CellStyle.Color = ColorHelper.FromArgb(0,42, 118, 189)
      
   	'Apply known colors to the text in cells D5 to E8
   	worksheet.Range("D5:E5").CellStyle.Font.Color = ExcelKnownColors.White
   	worksheet.Range("D7:E7").CellStyle.Font.Color = ExcelKnownColors.White
      
   	'Make the text as bold from D5 to E8
   	worksheet.Range("D5:E8").CellStyle.Font.Bold = True
      
   	'Apply alignment to the cells from D5 to E8
   	worksheet.Range("D5:E8").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
   	worksheet.Range("D5:E5").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
   	worksheet.Range("D7:E7").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
   	worksheet.Range("D6:E6").CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop
      
   	'Enter value and applying formatting in the cell A7
   	worksheet.Range("A7").Text = "  BILL TO"
   	worksheet.Range("A7").CellStyle.Color = ColorHelper.FromArgb(0, 42, 118, 189)
   	worksheet.Range("A7").CellStyle.Font.Bold = True
   	worksheet.Range("A7").CellStyle.Font.Color = ExcelKnownColors.White
      
   	'Apply alignment
   	worksheet.Range("A7").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft
   	worksheet.Range("A7").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
      
   	'Enter values in the cells A8 to A12
   	worksheet.Range("A8").Text = "Steyn"
   	worksheet.Range("A9").Text = "Great Lakes Food Market"
   	worksheet.Range("A10").Text = "20 Whitehall Rd"
   	worksheet.Range("A11").Text = "North Muskegon,USA"
   	worksheet.Range("A12").Text = "[phone]"
      
   	'Create a Hyperlink for e-mail in the cell A13
   	Dim hyperlink As IHyperLink = worksheet.HyperLinks.Add(worksheet.Range("A13"))
   	hyperlink.Type = ExcelHyperLinkType.Url
   	hyperlink.Address = "[e-mail]"
   	hyperlink.ScreenTip = "Send Mail"
      
   	'Merge column A and B from row 15 to 22
   	worksheet.Range("A15:B15").Merge()
   	worksheet.Range("A16:B16").Merge()
   	worksheet.Range("A17:B17").Merge()
   	worksheet.Range("A18:B18").Merge()
   	worksheet.Range("A19:B19").Merge()
   	worksheet.Range("A20:B20").Merge()
   	worksheet.Range("A21:B21").Merge()
   	worksheet.Range("A22:B22").Merge()
      
   	'Enter details of products and prices
   	worksheet.Range("A15").Text = "  DESCRIPTION"
   	worksheet.Range("C15").Text = "QTY"
   	worksheet.Range("D15").Text = "UNIT PRICE"
   	worksheet.Range("E15").Text = "AMOUNT"
   	worksheet.Range("A16").Text = "Cabrales Cheese"
   	worksheet.Range("A17").Text = "Chocos"
   	worksheet.Range("A18").Text = "Pasta"
   	worksheet.Range("A19").Text = "Cereals"
   	worksheet.Range("A20").Text = "Ice Cream"
   	worksheet.Range("C16").Number = 3
   	worksheet.Range("C17").Number = 2
   	worksheet.Range("C18").Number = 1
   	worksheet.Range("C19").Number = 4
   	worksheet.Range("C20").Number = 3
   	worksheet.Range("D16").Number = 21
   	worksheet.Range("D17").Number = 54
   	worksheet.Range("D18").Number = 10
   	worksheet.Range("D19").Number = 20
   	worksheet.Range("D20").Number = 30
   	worksheet.Range("D23").Text = "Total"
      
   	'Apply number format
   	worksheet.Range("D16:E22").NumberFormat = "$.00"
   	worksheet.Range("E23").NumberFormat = "$.00"
      
   	'Apply incremental formula for column Amount by multiplying Qty and UnitPrice
   	application.EnableIncrementalFormula = True
   	worksheet.Range("E16:E20").Formula = "=C16*D16"
      
   	'Formula for Sum the total
   	worksheet.Range("E23").Formula = "=SUM(E16:E22)"
      
   	'Apply borders
   	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeTop).LineStyle = ExcelLineStyle.Thin
   	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).LineStyle = ExcelLineStyle.Thin
   	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeTop).Color = ExcelKnownColors.Grey_25_percent
   	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).Color = ExcelKnownColors.Grey_25_percent
   	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeTop).LineStyle = ExcelLineStyle.Thin
   	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).LineStyle = ExcelLineStyle.Thin
   	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeTop).Color = ExcelKnownColors.Black
   	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).Color = ExcelKnownColors.Black
      
   	'Apply font setting for cells with product details
   	worksheet.Range("A3:E23").CellStyle.Font.FontName = "Arial"
   	worksheet.Range("A3:E23").CellStyle.Font.Size = 10
   	worksheet.Range("A15:E15").CellStyle.Font.Color = ExcelKnownColors.White
   	worksheet.Range("A15:E15").CellStyle.Font.Bold = True
   	worksheet.Range("D23:E23").CellStyle.Font.Bold = True
      
   	'Apply cell color
   	worksheet.Range("A15:E15").CellStyle.Color = ColorHelper.FromArgb(0, 42, 118, 189)
      
   	'Apply alignment to cells with product details
   	worksheet.Range("A15").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft
   	worksheet.Range("C15:C22").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
   	worksheet.Range("D15:E15").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
      
   	'Apply row height and column width to look good
   	worksheet.Range("A1").ColumnWidth = 36
   	worksheet.Range("B1").ColumnWidth = 11
   	worksheet.Range("C1").ColumnWidth = 8
   	worksheet.Range("D1:E1").ColumnWidth = 18
   	worksheet.Range("A1").RowHeight = 47
   	worksheet.Range("A2").RowHeight = 15
   	worksheet.Range("A3:A4").RowHeight = 15
   	worksheet.Range("A5").RowHeight = 18
   	worksheet.Range("A6").RowHeight = 29
   	worksheet.Range("A7").RowHeight = 18
   	worksheet.Range("A8").RowHeight = 15
   	worksheet.Range("A9:A14").RowHeight = 15
   	worksheet.Range("A15:A23").RowHeight = 18
      
   	'Save the Workbook
   	Dim storageFile As StorageFile
   	If Not Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons") Then
   		Dim savePicker As FileSavePicker = New FileSavePicker
   		savePicker.SuggestedStartLocation = PickerLocationId.Desktop
   		savePicker.SuggestedFileName = "Output"
   		savePicker.FileTypeChoices.Add("Excel Files", New List(Of String))
   		storageFile = savePicker.PickSaveFileAsync
   	Else
   		Dim local As StorageFolder = Windows.Storage.ApplicationData.Current.LocalFolder
   		storageFile = local.CreateFileAsync("Output.xlsx", CreationCollisionOption.ReplaceExisting)
   	End If
      
   	'Saving the workbook
   	Function workbook_SaveAsAsync_((ByVal Unknown As storageFile) As await Implements workbook.SaveAsAsync.(Of
   	End Function
      
   	'Launch the saved file
   	Function Windows_System_Launcher_LaunchFileAsync_((ByVal Unknown As storageFile) As await Implements Windows.System.Launcher.LaunchFileAsync.(Of
   	End Function
   End Using

A complete working example of how to create an Excel file in UWP in C# is present on this GitHub page.

By executing the program, you will get the Excel file as below.

Read and Edit Excel file

The below code illustrates how to read and edit an Excel file in UWP.

C#

//Create an instance of ExcelEngine
ExcelEngine excelEngine = new ExcelEngine();

IApplication application = excelEngine.Excel;

//Instantiates the File Picker. 
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.SuggestedStartLocation = PickerLocationId.Desktop;
openPicker.FileTypeFilter.Add(".xlsx");
openPicker.FileTypeFilter.Add(".xls");
StorageFile openFile = await openPicker.PickSingleFileAsync();

//Opens the workbook. 
IWorkbook workbook = await application.Workbooks.OpenAsync(openFile);

//Access first worksheet from the workbook.
IWorksheet worksheet = workbook.Worksheets[0];

//Set Text in cell A3.
worksheet.Range["A3"].Text ="Hello World";

//Access a cell value from Excel
var value = worksheet.Range["A1"].Value;

//Sets workbook version.
workbook.Version = ExcelVersion.Xlsx;

//Initializes FileSavePicker.
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.Desktop;
savePicker.SuggestedFileName = "CreateSpreadsheet";
savePicker.FileTypeChoices.Add("Excel Files", new List<string>() { ".xlsx" });

//Creates a storage file from FileSavePicker.
StorageFile storageFile = await savePicker.PickSaveFileAsync();

//Saves changes to the specified storage file.
await workbook.SaveAsAsync(storageFile);

workbook.Close();
excelEngine.Dispose();

VB.NET

'Create an instance of ExcelEngine
Dim excelEngine As ExcelEngine = New ExcelEngine()

Dim application As IApplication = excelEngine.Excel

'Instantiates the File Save Picker.  
Dim openPicker As New FileOpenPicker()
openPicker.SuggestedStartLocation = PickerLocationId.Desktop 
openPicker.FileTypeFilter.Add(".xlsx") 
openPicker.FileTypeFilter.Add(".xls") 
Dim openFile As StorageFile = Await openPicker.PickSingleFileAsync()

'Opens the Workbook. 
Dim workbook As IWorkbook = Await application.Workbooks.OpenAsync(openFile)
Dim workbook.SaveAsAsyncCType(As await, openFile)

'Access first worksheet from the workbook.
Dim worksheet As IWorksheet = workbook.Worksheets(0)

'Set Text in cell A3.
worksheet.Range("A3").Text ="Hello World"

'Access a cell value from Excel
Dim value As var = worksheet.Range("A1").Value

'Sets workbook version.
workbook.Version = ExcelVersion.Xlsx

'Initializes FileSavePicker.
Dim savePicker As New FileSavePicker()
savePicker.SuggestedStartLocation = PickerLocationId.Desktop
savePicker.SuggestedFileName = "CreateSpreadsheet"
savePicker.FileTypeChoices.Add("Excel Files", New List(Of String)() From {".xlsx"})

'Creates a storage file from FileSavePicker.
Dim storageFile As StorageFile = Await savePicker.PickSaveFileAsync()

'Saves changes to the specified storage file.
Await workbook.SaveAsAsync(storageFile)

workbook.Close()
excelEngine.Dispose()

A complete working example of how to read and edit an Excel file in UWP in C# is present on this GitHub page.

NOTE

Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, you also have to add “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to know about registering Syncfusion license key in your applications to use our components. You can also explore our UWP Excel library demo that shows how to create and modify Excel files from C# with just five lines of code.