Solved

DataItem on bound datagrid is nothing....why?

Posted on 2011-09-13
6
517 Views
Last Modified: 2012-05-12
On a web form, I have a grid bound to a list of business objects.   The grid is not editable but it has two auto-generated buttons, Edit and Select.   After clicking Select, I click Edit on the same row activates the code attached....

 
Private Sub GridViewRegistrants_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridViewRegistrants.RowEditing

        Session("PatientDetails") = GridViewRegistrants.SelectedRow.DataItem



        Response.Redirect("http://localhost:24820/UserDetails.aspx")

    End Sub

Open in new window


But for some reason, debugging shows the value of DataItem to be nothing, even though SelectedRow is not.    (Yeah, I know I need to fix localhost, I will get to that soon...)

What am I doing wrong?   How do I get a reference to the underlying object?   That is what I expected DataItem to provide.
0
Comment
Question by:codefinger
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 39

Accepted Solution

by:
Pratima Pharande earned 500 total points
ID: 36528122
I think you need something like this
mention the number of cell you want to get result Cells.Item(4)

 Dim strString As String

        strString= GridView1.SelectedRow.Cells.Item(4).Text.ToString

0
 

Author Comment

by:codefinger
ID: 36530025

That will work.  

I found out the reason my approach does not is that a web form does not maintain a connection to the list of items  (my last two projects were desktop winforms applications...I am spoiled!)
It uses the ViewState, so DataItem = Nothing is actually true.

My displayed column order is going to be changing around a lot as I work on the display.  Is there any way to reference the values by names instead of numbers?

0
 
LVL 83

Expert Comment

by:CodeCruiser
ID: 36532184
I think you can use column name in place of the column index.
0
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

 

Author Comment

by:codefinger
ID: 36532289
CodeCruiser:

I thought I remembered that as well, but it does not work:

GridViewRegistrants.SelectedRow.Cells.Item("LastName").Text      {"Conversion from string "LastName" to type 'Integer' is not valid."}      System.InvalidCastException
0
 
LVL 83

Expert Comment

by:CodeCruiser
ID: 36532334
Try

GridViewRegistrants.SelectedRow.Cells("LastName").Text

OR

GridViewRegistrants.Rows(GridViewRegistrants.SelectedIndex).Cells("LastName").Text
0
 

Author Closing Comment

by:codefinger
ID: 36532472
I found out the reason my approach does not work is that a web form does not maintain a connection to the list of items  (my last two projects were desktop winforms applications...I am spoiled!)
It uses the ViewState, so DataItem = Nothing is actually true.

So you have to take your values from the grid as the expert described.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

1.0 - Introduction Converting Visual Basic 6.0 (VB6) to Visual Basic 2008+ (VB.NET). If ever there was a subject full of murkiness and bad decisions, it is this one!   The first problem seems to be that people considering this task of converting…
Creating an analog clock UserControl seems fairly straight forward.  It is, after all, essentially just a circle with several lines in it!  Two common approaches for rendering an analog clock typically involve either manually calculating points with…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question