Update XLTM File via .NET

Modify XLTM spreadsheet via your .NET based applications without installing Microsoft Office^®.

For a developer, who is trying to update XLTM files via .NET application. Aspose.Total for .NET API can help to automate the updating process. It’s a full package of various .NET APIs dealing different formats including Microsoft Excel files. Aspose.Cells for .NET API that is part of Aspose.Total for .NET package makes this modifying process easy. Below is the process of updating the XLTM document.

How to Update XLTM File in .NET

Create new Workbook class object having the source XLTM file as parameter
Access of relevant Worksheet and relevant cell using Worksheets[0].Cells[column] method
Insert new data in the accessed cell using PutValue(data) method
Save the file as .xltm file using save() method by passing the file with path as the parameter

Modification Requirements

For XLTM modification, Microsoft Windows or a compatible OS with .NET, .NET Core, Mono or Xamarin Platforms
Development environment like Microsoft Visual Studio
Install from command line as nuget install Aspose.Cells or via Package Manager Console of Visual Studio with Install-Package Aspose.Cells
Alternatively, get the offline MSI installer or all DLLs in a ZIP file from Downloads

Code - Update XLTM File in .NET

	Workbook wkb = new Workbook("sourceFile.xlsx");

	Cell cellWithData = wkb.Worksheets[0].Cells["A1"];

	cellWithData.Value = 100;

	Cell cellWithFormula = wkb.Worksheets[1].Cells["C1"];

	cellWithFormula.Formula = "=Sum(A1,A20)";

	wkb.CalculateFormula();

	Worksheet sheet = wkb.Worksheets[1];

	Cell cell = sheet.Cells["A1"];

	cell.PutValue("Hello World!");

	wkb.Save("modified-targetfile.xlsx");

view raw update-excel-file-using-net.cs hosted with ❤ by GitHub

Explore File Editor Options with .NET

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Edit XLSX (Open XML Workbook)

Edit XLT (Excel 97 - 2003 Template)

Edit XLTM (Excel Macro-Enabled Template)

Edit XLTX (Excel Template)