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Invalid CurrentPageIndex value

Posted on 2009-07-08
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Last Modified: 2012-06-27
It was working fine and then boom all the sudden started to get this message.  I have not enabled anthing in the datagrid to be deleted or updated yet, the error starts from the page load. When i click on a page number it throw the error.
Invalid CurrentPageIndex value. It must be >= 0 and < the PageCount.
I have looked at several solution but non seem to work, don't know why.  the follwoing is my code for my pageindexchanged.  I added the if then else statment to try to resolve issue but I still get the error.
Private Sub myDataGrid_PageIndexChanged(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridPageChangedEventArgs) Handles myDataGrid.PageIndexChanged

        'Enable datagrid paging

        If myDataGrid.CurrentPageIndex >= myDataGrid.PageCount Then

            myDataGrid.CurrentPageIndex = myDataGrid.PageCount - 1

        End If

        myDataGrid.CurrentPageIndex = e.NewPageIndex

        myDataGrid.DataSource = myDataTable

        myDataGrid.DataBind()
 

    End Sub

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Question by:kdeutsch
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17 Comments
 
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Expert Comment

by:lppperes
ID: 24808440
Try using
        GridView1.PageIndex = e.NewPageIndex;
        GridView1.DataSource = myDataTable
        GridView1.DataBind();
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LVL 15

Expert Comment

by:jinal
ID: 24810022
Please verify that myDataTable contains records that you want to display.

For example  myDataTable should not be null or it should not changed. Like previously it has 100 records and now it has only 20 records . So if you give new page index and that out of scope so that error occur.

0
 

Author Comment

by:kdeutsch
ID: 24813150
lppperes,
That is what I originally started with but since I am still using asp.net 1.1 I need to use as such. It wa working then all the sudden stopped working, they do not have an ability to delete any of the files.  Paging does not work from the start.
 myDataGrid.CurrentPageIndex = e.NewPageIndex
        myDataGrid.DataSource = myDataTable
        myDataGrid.DataBind()

jinal,
Not sure what you are talking about.  It show the records, same amount as before but paging just stopped working.
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LVL 22

Expert Comment

by:prairiedog
ID: 24815368
Make sure you don't rebind the DataGrid upon postback, which means you have a "If Not IsPostBack Then" block in Page_Load.
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Author Comment

by:kdeutsch
ID: 24815859
HI,
this is the only code I have in postback statement, so are you saying I need to put the rebind in my postback.  Right now I am just filling a dropDown list.  Attached is all my code behind.
Help.txt
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LVL 22

Assisted Solution

by:prairiedog
prairiedog earned 200 total points
ID: 24816921
I think I know where the problem is.

At line 7 of the code snippet in your question, "myDataTable" seems to be empty. Where do you populate "myDataTable"?
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LVL 15

Accepted Solution

by:
jinal earned 300 total points
ID: 24817494
Try the following .

You need to store DataTable somewhere then retrieve back to for future use.

Here when your drop down selection index changed than you bind GridView but you did not store any data.

So when you change page index of grid view and myDataTAble is null . so problem. Try following .

Private Sub ddlUic_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlUic.SelectedIndexChanged

        Dim Unit As String = ddlUic.SelectedValue
 

        sql = "select intPositionId, strPara as Para, strLine as Line, intPositionNum as [Position #], strGrade as Grade, Substring(strMos,1,4) as MOS, strPosntitle as Title, " _

            & "strAuthBr as Branch, strFillType as Fill, bitAccepted as Accept from tblUnitPosition where intUnitMobId = '" & Unit & "'"
 

        myDataTable = New DataTable

        myDataTable = getData(sql)

        ViewState("DataToBind")=  myDataTable

        mydatagrid.DataSource = myDataTable

        mydatagrid.DataBind()
 

    End Sub
 
 

    Private Sub myDataGrid_PageIndexChanged(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridPageChangedEventArgs) Handles myDataGrid.PageIndexChanged

        

        myDataTable = (DataTable)ViewState("DataToBind")

        myDataGrid.CurrentPageIndex = e.NewPageIndex

        myDataGrid.DataSource = myDataTable

        myDataGrid.DataBind()
 

    End Sub

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Author Comment

by:kdeutsch
ID: 24817703
Hi,
OK I changed the bind as recommended with this statement added
 ViewState(sql) = myDataTable

But I am getting blue underlines with this statement in the pageIndexChanged statement
 MyDataTable = (DataTable)ViewState("Sql")  

Get Seperate blue underlines under Datable and ViewState
DataTable is a type and cannot be used as expression
End of satement expected

If I put in the "" in Daatable as such ("DataTable")
then i get on error
End of Statement expected
   
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LVL 22

Assisted Solution

by:prairiedog
prairiedog earned 200 total points
ID: 24817795
>>>MyDataTable = (DataTable)ViewState("Sql")
It's C# style, in VB.NET it should be:

myDataTable = CType(ViewState("Sql"), DataTable)
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LVL 22

Expert Comment

by:prairiedog
ID: 24817829
Also keep in mind that ViewState is case sensitive, which means ViewState("sql") is not the same as ViewState("Sql")
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Author Comment

by:kdeutsch
ID: 24818020
prairiedog,
Ok did not get the error but my datagrid disappeared.  Do I need to put this in my Postback load event
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LVL 22

Expert Comment

by:prairiedog
ID: 24818121
Post your current code please. It seems to me that myDataTable is empty.
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Author Comment

by:kdeutsch
ID: 24818179
Hi prairiedog,

I figured it out by looking at you past posts and making sure everything was same, I missed the "" around my dataFill.   One question though, now I need to start saving data in the grid to a DB with other information and I will start taking rows out of the datagrid.  Will this code still work??
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LVL 22

Expert Comment

by:prairiedog
ID: 24818210
>>now I need to start saving data in the grid to a DB with other information and I will start taking rows out of the datagrid.

Can you elaborate a bit?
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Author Comment

by:kdeutsch
ID: 24822395
HI,
I was babbling on, want the intent is that I search for a name in a db and save it to a specific row of the datagrid, when i do this I need to reload the datagrid.  Will this have an effect on the page index event.
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Author Closing Comment

by:kdeutsch
ID: 31601317
Thanks for everyones help
0
 
LVL 22

Expert Comment

by:prairiedog
ID: 24823608
It depends.

If you can ask a related question, then it will easier for us to understand your question better.
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