asp.net problem

Question

selectCourseList.SelectedIndex=Convert.ToInt32(selectCourseList.Items.FindByValue(newStudentCourseId));

giving following error Unable to cast object of type 'System.Web.UI.WebControls.ListItem' to type 'System.IConvertible'.

i don't understand whats wwrong with this

Actually, I dont understand, what do you want to do? be a specific pls — Serkan Hekimoglu
– Serkan Hekimoglu, Commented Jul 7, 2010 at 11:59
i have got newly added students courseId "newStudentCourseId" in string form, and i have a list box in which i want to set selected index of course to newly students added courseid — NoviceToDotNet
– NoviceToDotNet, Commented Jul 7, 2010 at 12:02

Martin Clarke · Accepted Answer · 2010-07-07 12:02:29Z

selectCourseList.Items.FindByValue(newStudentCourseId)

The above is going to give you a ListItem back, so you can't use Convert.ToInt32 and then set the index the way you're describing.

Instead try:

selectCourseList.Items.FindByValue(newStudentCourseId).Selected = true;

barrylloyd · Accepted Answer · 2010-07-07 12:01:32Z

selectCourseList.Items.FindByValue(newStudentCourseId) is returning some object that does not support the System.IConvertible interface - so the Convert.ToInt32 call is failing

What type of objects are in selectCourseList.Items ?

David · Accepted Answer · 2010-07-07 12:05:38Z

You can't convert a ListItem to an int. Try:

selectCourseList.SelectedIndex=selectCourseList.Items.IndexOf(selectCourseList.Items.FindByValue(newStudentCourseId));

ma7moud · Accepted Answer · 2010-07-07 12:05:50Z

0

Are you sur that the item value is a int type? Are you sur that the method FindByValue dont return a null for your parameter newStudentCourseId

answered Jul 7, 2010 at 12:05

ma7moud

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NoviceToDotNet Over a year ago

find by value talkes string parameter so i converted it to string type wile i was getting it int type ...but i had reconverted it to int type by using convertToInt32 but of no avail whats wrong i am not getting but i have got solution to my problem by seeing above solution but can u tell whats wrong in this

tanathos · Accepted Answer · 2010-07-07 12:06:31Z

0

I think something like (not tested):

selectCourseList.SelectedIndex=-1; selectCourseList.Items.FindByValue(newStudentCourseId).Selected = true;

where newStudentCourseId is a string representig the ItemValue of your DropDown.

answered Jul 7, 2010 at 12:06

tanathos

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1 Comment

NoviceToDotNet Over a year ago

find by value talkes string parameter so i converted it to string type wile i was getting it int type ...but i had reconverted it to int type by using convertToInt32 but of no avail whats wrong i am not getting but i have got solution to my problem by seeing above solution but can u tell whats wrong in this

fritterfatboy · Accepted Answer · 2010-07-07 12:09:31Z

Surely you need;

selectCourseList.SelectedIndex=selectCourseList.IndexOf(selectCourseList.Items.FindByValue(newStudentCourseId));

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