SwePeso --> we have to insert new actual data into server after deletion of old data
That doesn't really answer the question. Are you saying that you are inserting data and need to control the identity? If so, then aren't you already overridding the identity? (IDENITY INSERT) If not, then what Peso is asking is: What difference does it make what the Identity value is?
The identity value doesn't/shouldn't matter. If it does matter then I'd question the design. Do all the deletes you want and don't worry about the idenity value.