drop down list

[kalaivanan]

hi,
i am developing web application using c#.
in a particular page i am using two drop down list boxes, one for
product and the other for corresponding models of a product. whenever i
select a product the corresponding models will be populated in the
model drop down list. and i am using ajax for populating the model ddl.
hence the model ddl will be populated at the client. now when i do my
processing using the datum in the page i am getting the error
object reference not set to an instance of an object.

i think i am not able to read data at server which is populated at
client.
what is the solution fot this problem?

kalaivanan

[Ciaran O''Donnell]

RE: drop down list

Dont read the selected item from the drop down list. Get the selected item
from the form data (Request.Form["ddlname"]). The ddl wont automatically know
what was selected as it didnt originally send down the data that has been
selected. You may be able to fill it will a complete list of models on
Page_Init in order for it to be able to pick but using the form data is quite
easy and definately works.

Ciaran O'Donnell

"kalaivanan " wrote:

hi,
i am developing web application using c#.
in a particular page i am using two drop down list boxes, one for
product and the other for corresponding models of a product. whenever i
select a product the corresponding models will be populated in the
model drop down list. and i am using ajax for populating the model ddl.
hence the model ddl will be populated at the client. now when i do my
processing using the datum in the page i am getting the error
object reference not set to an instance of an object.
>
i think i am not able to read data at server which is populated at
client.
what is the solution fot this problem?
>
kalaivanan
>
>

[kalaivanan]

Re: drop down list


Ciaran O''Donnell wrote:

Dont read the selected item from the drop down list. Get the selected item
from the form data (Request.Form["ddlname"]). The ddl wont automatically know
what was selected as it didnt originally send down the data that has been
selected. You may be able to fill it will a complete list of models on
Page_Init in order for it to be able to pick but using the form data is quite
easy and definately works.
>
Ciaran O'Donnell
>
"kalaivanan " wrote:
>

hi,
i am developing web application using c#.
in a particular page i am using two drop down list boxes, one for
product and the other for corresponding models of a product. whenever i
select a product the corresponding models will be populated in the
model drop down list. and i am using ajax for populating the model ddl.
hence the model ddl will be populated at the client. now when i do my
processing using the datum in the page i am getting the error
object reference not set to an instance of an object.

i think i am not able to read data at server which is populated at
client.
what is the solution fot this problem?

kalaivanan

thanks man. it works