Hi,

I have a gridview that is being databound from a DataTable from code behind:

This works fine.

I need to get the values from the row in which a linkbutton is clicked, and this works too:

      Dim valdLB As LinkButton = TryCast(sender, LinkButton)

      Dim i As Integer = gvr.RowIndex - 4 'Minus four

I have also set them in Page.Load:

...as well as in the datatable:

   dt.Columns.Add("inkl")

   dt.Columns.Add("sats")

I know they are in the datatable because they show up in the gridview.

Now, when I try to retrieve the values in the sub shown above, it won't work (it worked when they were visible normal values). 

This is my code for now:

   myDDL.SelectedIndex = CInt(PosterGV.SelectedDataKey(0).Value.ToString())

I cant understand what's wrong, but I'm sure it has to do with the change to dkn. The error I get says the following:

System.NullReferenceException was unhandled by user code
  Message="Objektreferensen har inte angetts till en instans av ett objekt." (Meaning: The object reference has not been assigned an instance of an object)
  Source="App_Web_l_icdvjb"
  StackTrace:
       vid eko_reg.Andra_post(Object sender, EventArgs e) i C:\Documents and Settings\ ... .aspx.vb:rad 790
       vid System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
       vid System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
       vid System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
       vid System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
       vid System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
       vid System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
 

Please help me out! (I've tried setting the dkn of the gridview after the datasource has been defined, but to no avail.)

Pettrer, Stockholm

I don't think you can use a comma separated list as a data key.

 Try putting one of the values in a hidden control and use FindControl to get at the information and build the key back up yourself.
 

Hi,

Thanks for your reply. It should indeed be possible to have several datakeynames (according to msdn), but I still can't get it to work. I started out by making it work with hiddenfields in an itemtemplate of a gridview's column and got it to work, but the colums still show. I can work around that, but it seems like a rather messy way to accomplish this.

Best,
Pettrer