IncludeFullPath

public bool IncludeFullPath { get; set; }

Document doc = new Document(MyDir + "Document.docx");
DocumentBuilder builder = new DocumentBuilder(doc);

builder.MoveToDocumentEnd();
builder.Writeln();

// This FILENAME field will display the local system file name of the document we loaded.
FieldFileName field = (FieldFileName)builder.InsertField(FieldType.FieldFileName, true);
field.Update();

Assert.AreEqual(" FILENAME ", field.GetFieldCode());
Assert.AreEqual("Document.docx", field.Result);

builder.Writeln();

// By default, the FILENAME field shows the file's name, but not its full local file system path.
// We can set a flag to make it show the full file path.
field = (FieldFileName)builder.InsertField(FieldType.FieldFileName, true);
field.IncludeFullPath = true;
field.Update();

Assert.AreEqual(MyDir + "Document.docx", field.Result);

// We can also set a value for this property to
// override the value that the FILENAME field displays.
doc.FieldOptions.FileName = "FieldOptions.FILENAME.docx";
field.Update();

Assert.AreEqual(" FILENAME  \\p", field.GetFieldCode());
Assert.AreEqual("FieldOptions.FILENAME.docx", field.Result);

doc.UpdateFields();
doc.Save(ArtifactsDir + doc.FieldOptions.FileName);