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Thread: How to clear a Lookup Control in C#

John Wishart
Posts: 5

How to clear a Lookup Control in C# Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 05 Sep 09 4:00 AM

I would like to know how to reset the value of a Lookup control in C#.
I have an InserTicket form that has, amongst other controls, two Lookup controls and some text boxes. So the form entity type is ITicket; the first Lookup control is used to lookup the Account for the new ticket. I have written a code snippet action (which runs as the method of the OnCompleteActionItem of the Account Lookup OnChange action) that sets some of the ticket entity fields to values based on the selected accounts fields.
That works OK and the text boxes bound to those ticket fields show the new values after I do an account lookup.
What I would also like to do is clear the value in the 2nd lookup control when the account is changed. I have had not found a way to do this in the code snippet. I have tried to set the ticket field the Lookup is bound to string.Empty and to set the form.lookupId.Text to string.Empty, but the value in the control does not change, unlike the textboxes.
Any help indicating how I may achieve this in the above scenario would be greatly appreciated.

[Reply][Quote]

John Wishart
Posts: 5

Re: How to clear a Lookup Control in C# Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 05 Sep 09 6:41 AM

Of course the correct property to use to reset a Lookup is the LookupResultValue.
Setting both the field on the Ticket that is bound to the lookup result to string.Empty and having form.lookupId.LookupResultValue = string.Empty; has achieved the desired result.

[Reply][Quote]

Raul A. Chavez
Posts: 1300

Re: How to clear a Lookup Control in C# Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 08 Sep 09 1:32 PM

I am not saying that String.Empty isn't the correct value to be used, but I null it out.

I do so because the Lookup can be set to return a String or an Object (most do object), which is why I choose null. (And LookupResultValue is defined as object).

form.lookupId.LookupResultValue = null;

[Reply][Quote]

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