I have to to convert Word file to PDF using WAS with Csom but on Microsoft.Office.Word.Server.Conversions.syncConverter method give exception of Could not load file or assembly 'Microsoft.Office.Server. while Assembly is Added and file is fine. Below is my Code

using (System.IO.StreamReader sr = new System.IO.StreamReader(FileInfo.Stream))
    using (MemoryStream pdfContents = new MemoryStream())
        //var proxy = clientContext.Web.Context.ApplicationName..Proxies.Where(p => p is WordServiceApplicationProxy).FirstOrDefault();
        //if (proxy == null)
        //  return null;
        // Initialise Word Automation Service
        SyncConverter sc = new SyncConverter("Word Automation Service Application");
        //sc.UserToken = ;
        sc.Settings.UpdateFields = true;
        sc.Settings.OutputFormat = SaveFormat.PDF;
        // Convert to PDF
        ConversionItemInfo info = sc.Convert(sr.ToString(), pdfContents.ToString());
        if (info.Succeeded)
            var fileStream = new FileStream((string)sourceFile.ServerRelativeUrl, FileMode.Create, FileAccess.ReadWrite);

1 Answer 1


WAS cannot be used with CSOM. The class you're referencing is the Server Side Object Model (SSOM). This means that you need to deploy a Full Trust Solution using SSOM.

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