GridView批次新增、批次修改，怎麼做？

privatebool tableCopied = false;
private System.Data.DataTable originalDataTable;
protectedvoid GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
            if (!tableCopied)
            {
                originalDataTable = ((System.Data.DataRowView)e.Row.DataItem).Row.Table.Copy();
                ViewState["originalValuesDataTable"] = originalDataTable;
                tableCopied = true;
            }
    }
protected void UpdateButton_Click(object sender, EventArgs e)
{
    originalDataTable = (System.Data.DataTable)ViewState["originalValuesDataTable"];
foreach (GridViewRow r in GridView1.Rows)
        if (IsRowModified(r)) { GridView1.UpdateRow(r.RowIndex, false); }

// Rebind the Grid to repopulate the original values table.
    tableCopied = false;
    GridView1.DataBind();
}
protected bool IsRowModified(GridViewRow r)
{
    int currentID;
    string currentLastName;
    string currentFirstName;
currentID = Convert.ToInt32(GridView1.DataKeys[r.RowIndex].Value);
currentLastName = ((TextBox)r.FindControl("LastNameTextBox")).Text;
    currentFirstName = ((TextBox)r.FindControl("FirstNameTextBox")).Text;
System.Data.DataRow row = originalDataTable.Select(String.Format("EmployeeID = {0}", currentID))[0];
if (!currentLastName.Equals(row["LastName"].ToString())) { return true; }
    if (!currentFirstName.Equals(row["FirstName"].ToString())) { return true; }
return false;
}