Edit gridview and set field value = to Session variable

How can I set the value of a USER_NAME field to the value of a session variable?  

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
                ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>" 
                SelectCommand="SELECT PERSONNEL_ID, CATEGORY, NAME, RECORD_STATUS  FROM table WHERE (RECORD_STATUS = 'Active')"               
                UpdateCommand="UPDATE table SET CATEGORY = :CATEGORY, NAME = :NAME, RECORD_STATUS = :RECORD_STATUS, USER_ID= :USER_ID (PERSONNEL_ID = :PERSONNEL_ID)">
                <UpdateParameters>
                    <asp:Parameter Name="CATEGORY" />
                    <asp:Parameter Name="NAME" />
                    <asp:Parameter Name="RECORD_STATUS" />
                    <asp:Parameter Name="PERSONNEL_ID" />
                    <asp:Parameter Name="USER_ID"  DefaultValue=Session(userName) />
                </UpdateParameters>
            </asp:SqlDataSource>

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