What causes IndexOutOfRangeException?

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Hi there,
I'm using a datalist...but when I laod the control I get this error...But not everytime...
How to resolve this??
The error occurs at
Line
dlstPosts.DataBind();

objPage.FirstIndexInPage=-10
When I m debugging...Is this the issue?

DataSet dstAllPosts = new DataSet();
       .
       .//Filling data
       .
        PagedDataSource objPage = new PagedDataSource();
        objPage.AllowPaging = true;
        objPage.DataSource = dstAllPosts.Tables[0].DefaultView;
        objPage.PageSize = 10;
        objPage.CurrentPageIndex = currentPage;

        if (dstAllPosts.Tables[0].Rows.Count > 10)
        {
            lbtNext.Enabled = !objPage.IsLastPage;
            lbtPrev.Enabled = !objPage.IsFirstPage;
        }
        else
        {
            lbtNext.Enabled = false;
            lbtPrev.Enabled = false;
        }
       dlstPosts.DataSource = objPage;
       dlstPosts.DataBind();

VB

[IndexOutOfRangeException: Index -10 is either negative or above rows count.]
   System.Data.DataView.GetRow(Int32 index) +77
   System.Data.DataView.System.Collections.IList.get_Item(Int32 recordIndex) +10
   System.Web.UI.WebControls.EnumeratorOnIList.get_Current() +23
   System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +520
   System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +57
   System.Web.UI.WebControls.BaseDataList.DataBind() +62

.
.
.

VB

System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +13
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +43
   System.Web.UI.Control.OnLoad(EventArgs e) +80
   System.Web.UI.Control.LoadRecursive() +49
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3746

Thanks in advance...

Posted 28-Feb-11 23:05pm

aswathy.s.88

Updated 28-Feb-11 23:44pm

v4

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Sandeep Mewara · Answer 1 · 2011-02-28T23:32:00

Solution 3

IndexOutOfRangeException
IndexOutOfRangeException: Index -10 is either negative or above rows count.

Error type and the contents are self-explanatory in themselves. You are trying to use/access certain index which does not exists for a given collection object.

A simple use of DEBUGGER should easily help you out. Just look around the code line where you get this error and correct the logic that is trying to access the index which does not exist.

Details on the same:
IndexOutOfRangeException Class[^]

This surely would help: Troubleshooting Exceptions: System.IndexOutOfRangeException[^]

BTW, just by looking from naked eyes, start from here:

C#

objPage.DataSource = dstAllPosts.Tables[0].DefaultView;
objPage.PageSize = 10;
objPage.CurrentPageIndex = currentPage;

Error says -10 kinda thing. Looks like nothing was returned and yet you try to set it to some pagination. Check for number of records returned before setting up the pagination and counts.

Posted 28-Feb-11 23:32pm

Sandeep Mewara

Comments

aswathy.s.88 1-Mar-11 5:44am

The error occurs at
Line
dlstPosts.DataBind();

objPage.FirstIndexInPage=-10
When I m debugging...Is this the issue?

Sandeep Mewara 1-Mar-11 5:52am

objPage.FirstIndexInPage=-10
Yes, this is wrong. Resolve the logic.

aswathy.s.88 1-Mar-11 5:54am

But it is not possible to manually set objPage.FirstIndexInPage property

Sandeep Mewara 1-Mar-11 5:56am

Dude, as I said, handle pagination if you have more than 10 records.

Start step wise:
1. Remove pagination thing. Error should go away.
2. Put pagination logic and control but only if the record count is greater than 10 (page size)

aswathy.s.88 1-Mar-11 5:58am

Tanks...Let me try.... :)

aswathy.s.88 1-Mar-11 6:13am

Even this code doesnt work
DataSet dstAllPosts = new DataSet();

dstAllPosts = objBind.GetMyCommentedPosts(UserId);
PagedDataSource objPage = new PagedDataSource();

if (dstAllPosts.Tables[0].DefaultView.Count > 0)
{
objPage.DataSource = dstAllPosts.Tables[0].DefaultView;
}
dlstPosts.DataSource = objPage;
dlstPosts.DataBind();

Sandeep Mewara 1-Mar-11 6:30am

Dude! You need a basic first.

How does this "dstAllPosts.Tables[0].DefaultView.Count " give your record count? :doh:

Instead, try: dstAllPosts.Tables[0].Rows.Count and see.

Sandeep Mewara 1-Mar-11 6:30am

Further, your if only contains the datasource line. anything related to PagedDatasource should go into that.

aswathy.s.88 1-Mar-11 6:49am

Ya..It's a mistake...but that is not the issue for OutOfRangeException

aswathy.s.88 1-Mar-11 7:00am

I can't understand.
Sometimes the exception occurs....Mainly if the page is refreshed by hitting F5 this exception occurs though it filled correctly first time

Sergey Alexandrovich Kryukov 1-Mar-11 12:27pm

Wow! It takes patience, my 5.
--SA

Sandeep Mewara 1-Mar-11 12:59pm

:)

Sunasara Imdadhusen · Answer 2 · 2011-02-28T23:23:00

Solution 1

Hi,

you should check before index assign like

C#

if(dstAllPosts.Tables.Count > 0)objPage.DataSource = dstAllPosts.Tables[0].DefaultView;

if(currentPage >=0) objPage.CurrentPageIndex = currentPage;

Thanks,
Imdadhusen

Posted 28-Feb-11 23:23pm

Sunasara Imdadhusen

Piccadilly Yum Yum · Answer 3 · 2011-02-28T23:26:00

Solution 2

try with dstAllPosts.Tables[0].Rows.Count >= 10 :

C#

if (dstAllPosts.Tables[0].Rows.Count >= 10)
        {
            lbtNext.Enabled = !objPage.IsLastPage;
            lbtPrev.Enabled = !objPage.IsFirstPage;
        }
        else
        {
            lbtNext.Enabled = false;
            lbtPrev.Enabled = false;
        }

Posted 28-Feb-11 23:26pm

Piccadilly Yum Yum

Comments

aswathy.s.88 1-Mar-11 5:40am

But again I face the same error