Generate Barcode using C# - Add Barcodes to Documents and Images using Signature API for .NET

GenerateAndApplyBarcode.cs

// Generate and apply barcodes to documents (DOC, DOCX, PDF, PPT, XLS, XLSX, ...)
using (Signature signature = new Signature("path/document.pdf"))
{
    // Create barcode options with the barcode text
    BarcodeSignOptions options = new BarcodeSignOptions("Signed by GroupDocs using GroupDocs.Signature.")
    {
        // Set the Barcode Encoding Ttype
        EncodeType = BarcodeTypes.Code128,

        // Set Signature Position
        Left = 205,
        Top = 170,
        Width = 200,
        Height = 50
    };
    // Apply Barcode on document to Sign.
    SignResult result = signature.Sign("path/document-with-barcode.pdf", options);
}

GenerateAndApplyBarcodeToImages.cs

// Generate and apply barcodes to Images (JPG, PNG, BMP, ...)
using (Signature signature = new Signature("path/image.jpg"))
{
    // Create barcode options with the barcode text
    BarcodeSignOptions options = new BarcodeSignOptions("Signed by GroupDocs using GroupDocs.Signature.")
    {
        // Set the Barcode Encoding Ttype
        EncodeType = BarcodeTypes.Code128,

        // Set Signature Position
        Left = 20,
        Top = 150,
        Width = 160,
        Height = 30
    };
    // Apply Barcode on document to Sign.
    SignResult result = signature.Sign("path/document-with-barcode.jpg", options);
}