更新或插入时返回gridview的主键（ASP.NET，C#）

我需要对要审核的表进行所有更改，例如插入、更新和删除，并且我使用一个简单的SQLDataSource和GridView，以及自动生成的INSERT/UPDATE/DELETE语句。问题是，当一行被更新时，我想获取ID（主键）并将其放入审核表中——但因为更新查询的唯一参数是实际数据而不是主键，所以我不知道如何访问此信息。以下是我的更新查询：

InsertCommand="INSERT INTO [NominalCode] ([VAXCode], [Reference], [CostCentre], [Department], [ReportingCategory]) VALUES (@VAXCode, @Reference, @CostCentre, @Department, @ReportingCategory)" 

下面是审核的代码：

protected void SqlDataSource1_Updating(object sender, SqlDataSourceCommandEventArgs e)
    {
        string fields = e.Command.Parameters[0].Value.ToString() + "," + e.Command.Parameters[1].Value.ToString() + "," + e.Command.Parameters[2].Value.ToString() + "," + e.Command.Parameters[3].Value.ToString() + "," + e.Command.Parameters[4].Value.ToString();
        System.Security.Principal.  WindowsPrincipal p = System.Threading.Thread.CurrentPrincipal as System.Security.Principal.WindowsPrincipal;
        string[] namearray = p.Identity.Name.Split('\\');
        string name = namearray[1];
        string queryString = "INSERT INTO Audit (source, action, item, userid, timestamp) VALUES (@source, @action, @item, @userid, @timestamp)";
        using (SqlConnection connection = new SqlConnection("con string removed for privacy"))
        {
            SqlCommand command = new SqlCommand(queryString, connection);
            command.Parameters.AddWithValue("@source", "Nominal");
            command.Parameters.AddWithValue("@action", "Update");
            command.Parameters.AddWithValue("@item", fields);
            command.Parameters.AddWithValue("@userid", name);
            command.Parameters.AddWithValue("@timestamp", DateTime.Now);
            connection.Open();
            try
            {
                command.ExecuteNonQuery();
            }
            catch (Exception x)
            {
                Response.Write(x);
            }
            finally
            {
                connection.Close();
            }
        }
    }

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好吧，我觉得自己很愚蠢。ID当然位于SQL查询的WHERE子句中！出于某种原因，我粘贴了INSERT命令