Hi Asim,
#Regarding also guide me load file in
documenteditor on page load
Using open method in Document editor allows us to open the
Document in sfdt format. To open the document by default, call the open method
in the created event of Document editor which gets triggered once the control
is created.
To know more please refer the below documentation
https://helpej2.syncfusion.com/aspnetcore/documentation/document-editor/how-to/open-default-document#opening-a-default-document-in-documenteditor
#Regarding load , open and save file from server in
spreadsheet
To open/save the file from the server in spreadsheet by using
the
openFromJson and saveAsJson method.
To know more please refer the below documentation
https://www.syncfusion.com/kb/11970/how-to-open-and-save-an-excel-file-to-server-in-the-spreadsheet
Regards,
Ajithamarlin E