var reader = new PdfReader(/*Form File*/);
    var stamper = new PdfStamper(reader, new FileStream(result, FileMode.Create));

    var query = from property in type.GetProperties()
                join field in stamper.AcroFields.Fields
                    on property.Name equals field.Key
                select new
                {
                    field.Key,
                    Value = property.GetValue(model, null) as string
                };

    BaseFont font = BaseFont.CreateFont("c:\\windows\\fonts\\ARIALUNI.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
    foreach (var item in query)
    {
        stamper.AcroFields.AddSubstitutionFont(font);
        stamper.AcroFields.SetField(item.Key, item.Value);
    }

    stamper.FormFlattening = true;