DataGrid_SortCommand and DataGrid_PageIndexChanged events don't get triggered

[Jamie Wang]

I have a simple .NET DataGrid which I want to display in pages and allow
sorting on all the columns. It works on IIS on Windows XP machine but
doesn't work on the Windows 2003 Server machine. The DataGrid displays data
properly on the first page, but as soon as I click the page index, or click
a column heading to change to sort order, the grid disapprears. I put in
some debug code and find out that

private void myDataGrid_SortCommand(object source, System.Web.UI.WebControls.
DataGridSortCommandEventArgs e)
{
my custom code here
}

private void myDataGrid_PageIndexChanged(object sender, System.Web.UI.
WebControls.DataGridPageChangedEventArgs e)
{
my custom code here
}

never got invoked. It seems like an IIS 6 vs. IIS 5 issue. Does any one
have idea what caused this?