Index was out of range. Must be non negative and less than the size of the collection.

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This is my WebMethod

VB

<WebMethod(Description:="Fetch Nested Albums", EnableSession:=True)> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _
Public Function moveImages() As Object
    Dim FileCount As Integer = _
        HttpContext.Current.Request.Form(
            HttpContext.Current.Request.Form.Count - 2)
End Function

When i try to call the web service from the .aspx page i get this error

"Index was out of range. Must be non negative and less than the size of the collection."

How can i access the request Object? I was not able to access the session object in the web method, so i had to add EnableSession:=True in the Web Method.

So is there any setting for the request Object too?

Posted 14-Dec-12 2:34am

Member 7781963

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Thomas Daniels · Answer 1 · 2012-12-14T02:38:00

Solution 1

Hi,

I see this line:

VB

Dim FileCount As Integer =
        HttpContext.Current.Request.Form(
            HttpContext.Current.Request.Form.Count - 2)

If HttpContext.Current.Request.Form.Count is less than 2, then you try to take a form variable at place -1 (or -2, -3, ...).

Posted 14-Dec-12 2:38am

Thomas Daniels

Comments

Member 7781963 14-Dec-12 8:42am

Is there something wrong?

Thomas Daniels 14-Dec-12 8:43am

I think HttpContext.Current.Request.Form.Count is less then 2.

Member 7781963 14-Dec-12 8:50am

Actually when i execute the same code on a button click in the page code behind, it works.

Thomas Daniels 14-Dec-12 8:54am

Sometimes, there're more than 2 form variables.
Sometimes, there're less than 2 form variables.

Member 7781963 14-Dec-12 9:04am

actually the main reason i am trying to do it in a web method is to avoid post back..any way i can do it in a button click in the code behind without the post back?