Saving Dictionary to Session state

I am saving the Dictionary to a Session variable, but when I leave the method, I get this error:

Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.


HERE IS THE METHOD:


    protected void GridViewAssignedUserSkills_RowDataBound(object sender, GridViewRowEventArgs e)
    {        
        UserSkillChanges usc = new UserSkillChanges();

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DataRowView drv = (DataRowView)e.Row.DataItem;
           
            usc.SkillID = Int32.Parse(drv["skill_id"].ToString());
            usc.SkillLevel = Int32.Parse(drv["skill_level"].ToString());
            usc.SkillStateID = Int32.Parse(drv["skill_state_id"].ToString());
            usc.UserSkillID = Int32.Parse(drv["user_skill_id"].ToString());
            usc.UserID = Int32.Parse(drv["user_id"].ToString());

            userSkillsDictionary.Add(usc.SkillID, usc);

            Session["sessionUserSkillsDictionary"] = userSkillsDictionary;
        }
    }
}



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