NullReferenceException using RadFilter in Page_Load

[Kurtis]

Hi, I have a RadFilter that I am trying to add an expression to on the form load. The idea is that when someone clicks a hyperlink on a different page, they are redirected to a different page and the radfilter is set up for them with the data they clicked (in this specific case, it would Select Amends and put in the appropriate value.

I just want to mention that this code works exactly how I need it to when It is inside of a button click event on the page that gets redirected to.

The following is called in my page_load:

        pnlSearch.Visible = False
        pnlAdvanced.Visible = True

        Dim amendsByExpression = New RadFilterContainsFilterExpression("Amends")
        amendsByExpression.Value = Session("Search_Text")
        rfAdvancedSearch.RootGroup.AddExpression(amendsByExpression)
        rfAdvancedSearch.FireApplyCommand()

 

Why does the code above work when its encapsulated inside of a linkbutton click event, but not in the page load? How can I make it work in the Page Load?

[Kurtis]

Just for more information, my control on the aspx page looks like this:

<telerik:RadFilter ID="rfAdvancedSearch" runat="server" DataSourceControlID="dsBylaw" FilterContainerID="rgBylaw" SharedCalendarMinDate="1870-01-01" 
            Visible="True" DefaultFieldEditorFieldName="Title" 
            Localization-FilterFunctionIsNull="" 
            Localization-FilterFunctionNotIsNull="" 
            Localization-FilterFunctionIsEmpty="" 
            Localization-FilterFunctionNotIsEmpty=""
            Localization-FilterFunctionLessThanOrEqualTo="Less Than Or Equal To" 
            Localization-FilterFunctionGreaterThanOrEqualTo="Greater Than Or Equal To" 
            Localization-FilterFunctionGreaterThan="Greater Than" 
            Localization-FilterFunctionEqualTo="Equal To" 
            Localization-FilterFunctionEndsWith="" 
            Localization-FilterFunctionLessThan="Less Than" 
            Localization-FilterFunctionStartsWith=""
            Localization-FilterFunctionDoesNotContain="" 
            Localization-FilterFunctionNotBetween="" 
            Localization-FilterFunctionNotEqualTo="">
        </telerik:RadFilter>

 

 

[Eyup]

Hi Kurtis,

You can check the following live sample:
http://demos.telerik.com/aspnet-ajax/filter/examples/field-editors/defaultcs.aspx

Alternatively, you can try to do that on a different stage of the page life cycle, for example PreRender.

Regards,
Eyup
Telerik