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// Open an Excel file that contains the worksheets:
// Products1, Products2 and Products3
Workbook workbook = new Workbook("Products.xlsx");

// Add a worksheet named Summary_sheet
Worksheet summarySheet = workbook.Worksheets.Add("Summary_sheet");

// Iterate over source worksheets whose data you want to copy to the
// summary worksheet
string[] nameOfSourceWorksheets = { "Products1", "Products2", "Products3" };

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// Open the first excel file.
Workbook SourceBook1 = new Workbook("Excel A.xlsx");

// Open the second excel file.
Workbook SourceBook2 = new Workbook("Excel B.xlsx");

// Open the third excel file.
Workbook SourceBook3 = new Workbook("Excel C.xlsx");

// Copy worksheets of second Excel file to the first workbook.

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// Open Excel A file.
Workbook excelA = new Workbook("Excel A.xlsx");

// Open Excel B file.
Workbook excelB = new Workbook("Excel B.xlsx");

// Create destination Workbook.
Workbook destWorkbook = new Workbook();
// First worksheet is added by default to the Workbook. Add the second worksheet.
destWorkbook.Worksheets.Add();

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// PDF Load Options
GroupDocs.Conversion.Contracts.Func<LoadOptions> getLoadOptions = () => new PdfLoadOptions
{
    FlattenAllFields = true,    // all fields in the source document will be flatten during conversion
    Password = "123"            // provide password if document is password protected
};

// Excel Convert Options
SpreadsheetConvertOptions options = new SpreadsheetConvertOptions
{

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Render Visio Files in other formats using Java
1. Render Visio (.vsdx) to JPG
2. Render Visio (.vsdx) to PNG
3. Render Visio (.vstx) to PDF
4. Render Visio (.vssx) to HTML

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Convert HTML to PDF and PDF to HTML using C# .NET API

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// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET
Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

builder.InsertImage(dataDir + "Watermark.png");
dataDir = dataDir + "DocumentBuilderInsertInlineImage_out.doc";
doc.Save(dataDir);

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Compare PDF Files using C#
1. Compare Two PDF Files using C#
2. Compare Password Protected PDF Files using C#

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This Gist contains the code snippet for JPG image to PNG conversion and also, JPEG to PDF conversion using C# .NET 

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Sign Documents with Digital Signatures using Java
1. Sign PDF Documents using Java
2. Sign Word Documents using Java