Digitally sign Excel worksheet

readme.md

How to Add a Digital Signature to Excel Files using C# .NET

Learn how to digitally sign Excel files using C# .NET with our step-by-step guide. Discover how to insert an electronic signature, including Excel digital signature and sign on Excel features. Start signing Excel documents securely and efficiently today using Aspose.Cells Cloud SDK for .NET .

For complete information, please visit How to Add a Digital Signature to Excel Files using C# .NET.

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Add Digital Signature to Excel

Add digital signature for Excel workbook

digital-sign-excel.cs

// For complete examples and data files, please go to 
https://github.com/aspose-cells-cloud/aspose-cells-cloud-dotnet/

// Get client credentials from https://dashboard.aspose.cloud/
string clientSecret = "4d84d5f6584160cbd91dba1fe145db14";
string clientID = "bb959721-5780-4be6-be35-ff5c3a6aa4a2";
        
// create CellsApi instance while passing ClientID and ClientSecret
CellsApi cellsInstance = new CellsApi(clientID, clientSecret);

// first Excel workbook on drive
string input_Excel = "source.xlsx";
// name of digital certificate
string signature_File = "test1234.pfx";

try
{
    // read the Excel file and upload to cloud storage
    cellsInstance.UploadFile(input_Excel, File.OpenRead(input_Excel));
    
    // read Digital certificate and upload to cloud storage
    cellsInstance.UploadFile(signature_File, File.OpenRead(signature_File));

    // initialize the digital sign operation
    var response = cellsInstance.CellsWorkbookPostDigitalSignature(input_Excel, signature_File, "test1234");

    // print success message if concatenation is successful
    if (response != null && response.Equals("OK"))
    {
        Console.WriteLine("Digital Signature added successfully !");
        Console.ReadKey();
    }
}
catch (Exception ex)
{
    Console.WriteLine("error:" + ex.Message + "\n" + ex.StackTrace);
}