Datagrid Add new Row problkem

Discussion in 'ASP .Net Datagrid Control' started by Vishal, Feb 23, 2005.

  1. Vishal

    Vishal Guest


    I have a datagrid, which creates the columns
    dynamically based on the columns in the dataset. Now I
    need to add an additional row for each exisiting row AND
    hide that row, by default. This row will contain my
    usercontrol, which I will add also dynamically.
    Unfortunaly I am not able to do so. I tried two options:

    1.) I added the rows to the dataset and bound the dataset
    to the datagrid.

    - The problem however is, that I am not able to set the
    span of that row somehow. I set it, but it doesnt take it.

    - The second problem is that I am not able to hide it. I
    dont see any attributes property for the DataRow. Here is
    the code:

    ...begin loop through the rows
    Dim NestedGridRow As DataRow = ds.Tables(0).NewRow
    Dim NestedCell As New TableCell
    NestedCell.ColumnSpan = 3 'ds.Tables(0).Columns.Count
    ds.Tables(0).Rows.InsertAt(NestedGridRow, nRowPosition)
    nRowPosition = nRowPosition + 2
    ...end loop through the rows

    2.) I tried to add the columns direclty to the datagrid,
    via the following code:

    ...begin loop through the rows
    Dim dgItem As DataGridItem
    Dim dgCell As TableCell
    dgItem = New DataGridItem(0, 0, ListItemType.Item)
    dgCell = New TableCell
    dgCell.ColumnSpan = AADataGridStores.Columns.Count
    dgCell.Text = "Testing something..."
    Dim t As Table = AADataGridStores.Controls(0)
    t.Rows.AddAt(nRowPosition, dgItem)
    nRowPosition = nRowPosition + 2
    ...end loop through the rows

    But this doesnt work too and it gives the error:
    Specified argument was out of the range of valid values.
    Parameter name: index

    Now how I am supposed to add a new row which I can hide?
    Manually, I would place the row into a placeholder and set
    the placeholder property either to true/false. But I am
    not getting how to do that in my situation. Can somebody
    please help me with this one?

    Vishal, Feb 23, 2005
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  2. Vishal

    Elton Wang Guest

    Hi Vishal,

    I think basically your code of second option is OK. But,
    there two things you should take into consideration:

    1. Where to run the code? It should be after datagrid data
    binding. It may be in PreRender.

    2. Loop scope. Depending on different setting, you may
    have or not Pager, Header, Footer. If you have any of
    them, you should count them and add rows beyond them.


    Elton Wang
    Elton Wang, Feb 23, 2005
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  3. Vishal

    Vishal Guest

    Hi Elton,

    But i got the error as provided in the first message. I
    am adding the code right now in Init. Do you think thats
    the problem? How should I hide the row? Basically, the
    datagrid will contain a button in each row, which will
    lets me hide or show the nested row. As said I would did
    that with a placeholder, but dunno, how to do it in my
    current situation. Any help is greatly appreciated.

    Vishal, Feb 23, 2005
  4. Vishal

    Elton Wang Guest

    Hi Vishal,

    As I mentioned, your logic is OK. But there are maybe two
    things (maybe one of them maybe both of them) that cause
    the trouble. One maybe is in wrong place to run your logic
    (you can move code to Datagrid_PreRender). Another one is
    from and to which exact row position you add those new
    rows, I mean in

    NRowPosition = ?startPositin
    While (condition ?)

    Currently you are using
    dgCell.Text = "Testing something..."

    You might use
    in real situation.


    Elton Wang, Feb 23, 2005
  5. Vishal

    Vishal Guest

    Hey Elton,

    thanks for responding. I will try to move the code but
    what about hiding the row? How should I do that?
    Vishal, Feb 23, 2005
  6. Vishal

    Vishal Guest

    Is OnPreRender and DataGrid_PreRender the same? I have
    currently defined it in page like this:

    Protected Overloads Sub OnPreRender()
    end sub

    Is that ok?
    Vishal, Feb 23, 2005
  7. Vishal

    Vishal Guest

    Furtheremore isnt PreRender already to late? I mean will
    it keep its viewstate?
    Vishal, Feb 23, 2005
  8. Vishal

    Vishal Guest

    I added the code to the PreRender and now my complete dg
    doesnt show up...

    Private Sub AADataGridStores_PreRender(ByVal sender As
    Object, ByVal e As System.EventArgs) Handles
    End Sub
    Vishal, Feb 23, 2005
  9. Vishal

    Elton Wang Guest

    You are right. It seems the viewstate can't keep added
    rows, even add them very early (Page_Load, right after
    data binding). So once postback, it shows trouble. But it
    can't be done befor data binding. Currently I don't know
    how to figure it out. If you find solution, please share
    your idea.

    Elton Wang, Feb 24, 2005
  10. Vishal

    Vishal Guest

    Vishal, Feb 24, 2005
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