Static datatable Problem

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ASP.NET

session

Now a days, Iam creating a time sheet application.

In that time sheet entry page, iam using a static datatable .
Static datatable is used for holding the records for current day entered by employee.
So that he/she can easily edit and insert the records.
It is working fine for single user..

But the problem is that , when multiple users logged on , one user get values of another user. when both the user logged on, they also cannot edit the records in the datatable.

Iam using a gridview to perform this whole operations.

is i use view state to store the datatable..?
or
use datatable with the name of employee name/id.?

please give answer ASAP.