SoftEdge

public SoftEdgeFormat SoftEdge { get; }

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

SvgSaveOptions saveOptions = new SvgSaveOptions();
saveOptions.MaxImageResolution = 72;

doc.Save(ArtifactsDir + "SvgSaveOptions.MaxImageResolution.svg", saveOptions);

DocumentBuilder builder = new DocumentBuilder();
Shape shape = builder.InsertShape(ShapeType.Rectangle, 200, 200);

// Apply soft edge to the shape.
shape.SoftEdge.Radius = 30;

builder.Document.Save(ArtifactsDir + "Shape.SoftEdge.docx");

// Load document with rectangle shape with soft edge.
Document doc = new Document(ArtifactsDir + "Shape.SoftEdge.docx");
shape = (Shape)doc.GetChild(NodeType.Shape, 0, true);

// Check soft edge radius.
Assert.AreEqual(30, shape.SoftEdge.Radius);

// Remove soft edge from the shape.
shape.SoftEdge.Remove();

// Check radius of the removed soft edge.
Assert.AreEqual(0, shape.SoftEdge.Radius);