// For complete examples and data files, please go to https://github.com/aspose-diagram/Aspose.Diagram-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_Shapes();

// Load stencil file to a diagram object
Diagram stencil = new Diagram(dataDir + "Timeline.vss");
// Get master
Master master = stencil.Masters.GetMaster(1);

using (System.IO.MemoryStream stream = new System.IO.MemoryStream(master.Icon))
{
    // Load memory stream into bitmap object
    System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(stream);
    // Save as png format
    bitmap.Save(dataDir + "MasterIcon_out.png", System.Drawing.Imaging.ImageFormat.Png);
}