i'm new to this forum but i sure i'm in the right place to ask my question.
Could some tell me if it's possible to insert content in SpreadsheetDocument as in WordDocument and change thier value at runtime.
Actually i have an excel template and woul like to open the file in runtime an change the value of some cell then save the file back.
appreciate any help!
Yes, you can certainly do that. If you are new to Open XML development, then look at Eric White's series and also mine about SpreadsheetML.