Hi Toprak,
We have created a sample based on the requirement, please refer the sample from the attachment.
In this sample by default two diagram is saved into the database. Once this sample is loaded the first diagram will be loaded from the database. All the available saved diagram will be listed in Combobox, one of the diagram can be loaded by selecting the item from the combobox. Diagram can be saved back to the database by clicking the save button. New button can be clicked to create a new diagram.
Please let us know if you have any further concerns.
Regards,
Jegan
DBDiagramSaveLoad_a437093d.zip