csrf token ,security issue?

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ASP.NET

Can you please help me to resolve CSRF issue found during using asp.net 2.0.

Issue description :

[1 of 3] Cross-Site Request Forgery
Severity: Medium
Test Type: Application
Vulnerable URL: https://somesite/somepage.aspx
Remediation Tasks: Decline malicious requests

Reasoning:
The same request was sent twice in different sessions and the same response was received.
This shows that none of the parameters are dynamic (session identifiers are sent only in
cookies) and therefore that the application is vulnerable to this issue.