Hi Alex ,
Kindly accept our sincere apologies for the delay in getting back to you.
The LoadSOAP and SaveSOAP methods use the SOAP XML format to serialize diagrams to files and I / O streams. Please refer to the following code snippet
[C#]
//To save the diagram in Xml format.
this.diagram1.SaveSoap( string FileName);
//To load the diagram in Xml format.
this.diagram1.LoadSoap( string FileName);
I have attached the sample for your reference. In this sample when you click on File->save menuitem you can save the diagram in xml file. When you click on File->open menuitem you can load the diagram from the xml file.
http://websamples.syncfusion.com/samples/Diagram.Windows/F68983/main.htmPlease refer to the sample and let me know if this helps.
Regards,
Nagaraj