The wait operation timed out on list

[AndreasV]

using asp.net v.12.0.3

We have a table "deliveries" with 40 cols and about 400,000 rows.
When we try to open the corresponding list based on this table, we get:
"The wait operation timed out" on line:
Line 890:</form>
Line 891:@if (DELIVERIES_list.Recordset != null) { // Close recordset
Line 892: DELIVERIES_list.Recordset.Close();
Line 893: DELIVERIES_list.Recordset.Dispose();
Line 894:}

What I did is to open the project using VS2015 and comment out the above lines. Then the program opens correctly...

Is there any solution to the above problem according to your knowledge please?
Is 't it strange that the problem located in the close of the recordset?

Thank you very much for your time!!

[Webmaster]

You probably have too many records to be displayed in the list page. Enable the "Requires Search Criteria" option to show no records first. Alternatively add a table filter to limit the number of records.

[AndreasV]

As usual the answer to any problem is as simple as a checked value on a check box... :-)

Thank you so much