RadGrid not DataBound by PreRender

[Diane]

Hi,

I am having difficulty with the RadGrid control (inside a user control) not databinding items by the PreRender event. The documentation says the lifecycle is as follows:

First page load:
Page.Load
Grid_Instance.NeedDataSource
Foreach Item in Grid_Instance:
ItemCreated
ItemDataBound
Page.PreRender

I am binding to a ObjectDataSource control:

  <telerik:RadGrid ID="rgProgrammes" runat="server" AutoGenerateColumns="False"
  DataSourceID="ods_Programmes" GridLines="None" Skin="Office2007">
                <MasterTableView DataKeyNames="pim_ID, CombinedCode" DataSourceID="ods_Programmes">

(i also bind to a GridView to check if that works)
Then in code behind I do a simple check for if it has databound :

    protected void Page_PreRender(object sender, EventArgs e)
    {
        int test = rgProgrammes.Items.Count; //result = 0
        int test2 = GridView1.Rows.Count; //result = 3
    }

Have I misunderstood something about the lifecycle of the RadGrid? When I insert breakpoints in my code, the Page_PreRender
event gets called before the RadGrid_DataBound event. This is giving me difficulty using a RadGrid in a user control
.

Any help would be appreciated.
Tom

[Tsvetoslav]

Hello TomL,

Please, note that the case you are looking at in the documentation uses the NeedDataSource event to bind the grid - in this case the event sequence follows precisely the one given in the help article. However, when you set the DataSourceID property of the grid - the sequence of the events on initial page load is different - the Page_Prerender event comes before the grid's ItemDataBound.

Best Regards,
Tsvetoslav
the Telerik team

Check out Telerik Trainer , the state of the art learning tool for Telerik products.

[adamhughes]

So, when client data binding, how to make sure PreRender comes after data has been bound?

[Eyup]

Hello,

The PreRender event is raised on server-side. When using client-side binding for the grid, there is no data at server-side at all. The grid gets its content on client-side and you can use JavaScript function with the client-side events provided by the grid to capture this moment. For example - OnRowDataBound:
https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/client-side-programming/events/onrowdatabound

I hope this will prove helpful.

Regards,
Eyup
Progress Telerik