Web Forms :: Unable To Add List Obj Into Arraylist
Feb 12, 2010
I am trying to retrieve a arraylist frm a session and add in more objects into the arraylist on top of the existing object in the arraylist.But i have encounter problem at the foreach loop where it promted me a error message shown below
Object reference not set to an instance of an object.
below are the sample code.
public void addItemToArraylist(List<LibraryItem> temp) //l temp pass in 5 items each tim
{
ArrayList storeItems = new ArrayList();
storeItems = (ArrayList)Session["storeItems"];
foreach (LibraryItem items in temp)
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openDB() Dim inList As String Dim getCourses For k As Integer = 0 To arLcID.Count - 1 If k > 0 Then inList &= "," End If inList = arLcID(k).ToString getCourses = "select cID,cCode,cUnit from [university].[Courses_1] where cID ='" & inList & "'" insertCMD = New Data.SqlClient.SqlCommand
[Code] ....
This code is not returning any value, when the arraylist is removed it returns value.
I've been trying to bound an arraylist to a grdview for display and managed to work out the following:
[Code]....
At the point where rows are added to dt, i'm trying to get arraylist (Tweet) to be read row by row to insert each of it's fields into dt. There is no error but when run in browser, each cell of the gridview shows 'DataExtraction.Tweet'.I'm not sure where to go from here.
I have an arraylist that contains some values. (e.g. playerName). I also queried for values in the database (e.g. playerName, playerSales) and I need to match the playerName in the arraylist to the corresponding ones that I did a query from the database. (match those with the same playerName). From there, I need to create a bar graph with the respective playerName and their sales (playerSales).
A portion of the code is shown below:
[Code]....
The arraylist I mentioned was saved to a session to be used in another page. Is my code right? And how can I create the graph from the values?
