Problem: Dynamic TemplateFields in GridView

[Ananthu]

I have created a templatefield at runtime for checkboxcolumn in gridview using Itemplate Interface and InstanceIn methods.

I have given the id for checkbox also.

I get the checkbox column in gridview successfully.

Now i want to check all the checkbox in gridview.

But when i find checkbox controls in gridview with respect to the id i have given, it returns me nothing.

Following is the code in InstanceIn method of class GridViewTemplate which Implements Itemplate.

Select case ListItemType.Item
 
 Case ListItemType.Item
 
  Dim chk as checkbox
  chk=new checkbox
  chk.id="chkSelRoom"
  Container.items.add(chk)
 
End Select
 

Code for Finding Checkbox Control in GridView.

For each row as GridViewRow in dgvRoomDetails.rows
 
 dim ch as checkbox
 ch=new checkbox
 ch=CType(row.FindControl("chkSelRoom"),checkbox)  // returns nothing
 ch.checked=true  // object reference not set to an instance of the object
 
End For
 

Error are shown as comments in above code.

[Ananthu]

Hi,

I have created a dynamic templatefields (checkbox and textbox) for gridview successfully by writing code using ITemplate Interface.

I have loaded the gridview dynamic columns in Form_Load event and also inside the Page.IsPostBack condition only.

I am having checkbox column and textbox column in my gridview when loading a page.

But when I click the button control in that page, the templatefields checkbox and textbox column gets removed and only empty columns are displayed after that. But other columns Bounfields are displayed properly.

What's the problem?

Give me solution for it.

Thanks in advance.

[Ananthu]

I found the answer by myself. The reason is that I should load the dynamic columns of gridview in Page_PreInit event and not in Page_load event. That's it. It worked fine. Now i am able to check all checkbox in gridview by a button click event.

[Ananthu]

Hi,

I found the answer by myself. The reason is that I should load the dynamic columns of gridview in Page_PreInit event and not in Page_load event. That's it. It worked fine. Now the template columns are not disappearing.

Thanks if you have also tried with my posted question.

[Frinavale]

I'm really happy that you've solved your problem.
I looked at my code that is similar to yours (except that I use link buttons instead of check boxes) and could not think of anything that would explain the problem that you were having.

I should have known it had something to do with where you were dynamically instantiating these controls.

Thanks for sharing your solution!

-Frinny