C# – open Word file and convert to PDF

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Open a Word file with C# and convert it to PDF.

In order to work with Word files in C#, we have to add the „Microsoft.Offcie.Interop.Word“ reference to the project.

After that, we can open the file:

var application = new Application();
var document = application.Documents.Open(textBoxUrl.Text);
//do actions (e.g. export to PDF)
var pdfFileName = "c:\\_temp\\export.pdf";
document.ExportAsFixedFormat(pdfFileName, WdExportFormat.wdExportFormatPDF);

In our example we take the path from an TextBox and export the file to a given location. The path for the Open method can either be a local URL or an URL, for example Sharepoint. However you need to be authenticated with Sharepoint to get this working.

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