Listbox Selection in C#.net

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li_Make.Items.FindByText("Maruti Suzuki").Selected = true;

li_make is a listbox with Car makes binded on it...WHen i try to find a make in the above way i get the object reference not found error...error occurs only when the string passed to the findbytext function contains space or hyphen...how can i avoid this...thank you for your comments in advance

Posted 17-Jan-13 20:16pm

reogeo2008

Updated 18-Jan-13 18:47pm

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Comments

Sergey Alexandrovich Kryukov 18-Jan-13 2:18am

Which ListBox? Do you think there is only one? :-)
Full type name, please. And tag your UI library or application type.
—SA

ram mohan 18-Jan-13 3:49am

Do null check before selection is must.

Nandakishore G N 18-Jan-13 4:31am

where are you placing that code?

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Valery Possoz · Answer 1 · 2013-01-18T23:19:00

Hi,

You need to test if

C#

li_Make.Items.FindByText("Maruti Suzuki")

is null before using one of its properties.

If you use an object property and the object is null then it will throw an exception object reference not found.

To avoid throwing the exception you could do a test before using your object, for example in that way:

SQL

if (li_Make.Items.FindByText("Maruti Suzuki")!= null)
    li_Make.Items.FindByText("Maruti Suzuki").Selected = true;

you can see details about his exception here:
http://msdn.microsoft.com/en-us/library/system.data.objectnotfoundexception.aspx[^]

Valery.