call code-behind method from markup

[ZeBula8]

How do I call a code-behind method from my markup?
I want to call this method in the OnClick event as shown below: AddRow()

 <asp:TemplateField>
                <HeaderTemplate>
                    <asp:Button ID="AddButton" runat="server" Text="Add" OnClick='<%#AddRow()%>' />
                </HeaderTemplate>
                <ItemStyle  HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:LinkButton ID="DeleteLinkButton" runat="server" CausesValidation="False" CommandArgument='<%# Container.DataItemIndex %>'
                        CommandName="Delete" Text="Delete"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>

[vbdotnetboy]

just wondering why don't you use the button's click event just double click on the button and it will add the markup and the method in the code-behind

[ZeBula8]

because the button is in the header of a gridview and can't be 'double-clicked' unfortunately.

[vbdotnetboy]

ok then in your code-behind do this

Protected Sub AddRow_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    'do your stuff here
End Sub

in the markup

 <asp:TemplateField>
                <HeaderTemplate>
                    <asp:Button ID="AddButton" runat="server" Text="Add" OnClick="AddRow_Click" />
                </HeaderTemplate>
                <ItemStyle  HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:LinkButton ID="DeleteLinkButton" runat="server" CausesValidation="False" CommandArgument='<%# Container.DataItemIndex %>'
                        CommandName="Delete" Text="Delete"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>

[vbdotnetboy]

but just so you know it can be clicked too... i'm making screen shots for you

[vbdotnetboy]

look at the image i've made 3 steps... enjoy

[ZeBula8]

thanks for the image help...

it created the click event okay, and when i put a break on the event it is never hit when i click the button on the page.

any idea why?

[vbdotnetboy]

lets see code because i have no problem doing it

[ZeBula8]

Double-clicking the button created the code stub below. I put a breakpoint on Public.. but nothing when I click the button.

  Public Sub AddNewRowButton_OnClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles AddNewRowButton.Click


    Console.WriteLine()
  End Sub

partial markup:

            <asp:TemplateField>
                <HeaderTemplate>
                    <asp:Button ID="AddNewRowButton" runat="server" Text="Add" />
                </HeaderTemplate>
                <ItemStyle HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:LinkButton ID="DeleteLinkButton" runat="server" CausesValidation="False" CommandArgument='<%# Container.DataItemIndex %>'
                        CommandName="Delete" Text="Delete"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>

[vbdotnetboy]

no no no you can't do the Handles click part from within a template

Public Sub AddNewRowButton_OnClick(ByVal sender As Object, ByVal e As System.EventArgs)
 
    Console.WriteLine()
  End Sub

            <asp:TemplateField>
                <HeaderTemplate>
                    <asp:Button ID="AddNewRowButton" runat="server" Text="Add" OnClick="
AddNewRowButton_OnClick" />
                </HeaderTemplate>
                <ItemStyle HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:LinkButton ID="DeleteLinkButton" runat="server" CausesValidation="False" CommandArgument='<%# Container.DataItemIndex %>'
                        CommandName="Delete" Text="Delete"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>

[ZeBula8]

i removed the Handles... nothing. Event still doesn't fire.

this is a killer.

[ZeBula8]

vbdotnetboy, thanks for all of your help though.

[vbdotnetboy]

look at the markup i posted.... notice the OnClick attribute

[vbdotnetboy]

<asp:TemplateField>
                <HeaderTemplate>
                    <asp:Button ID="AddNewRowButton" runat="server" Text="Add" OnClick="
AddNewRowButton_OnClick" />
                </HeaderTemplate>
                <ItemStyle HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:LinkButton ID="DeleteLinkButton" runat="server" CausesValidation="False" CommandArgument='<%# Container.DataItemIndex %>'
                        CommandName="Delete" Text="Delete"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>

[ZeBula8]

Yes, I put the OnClick method just like you have it and still the event doesn't fire.

I'm wondering if Masterpages has something to do with this since this page has master.

I just tried this same code at home, without master page, and the event fires just fine.

[mendhak]

Is that a gridview? If so, use the Gridview's RowCommand event. It handles all events bubbled up from inside the grid, and you will need to set a commandsource and commandname property for it.

[ZeBula8]

okay... i have finally got the event to fire.

It seems that if markup's <%#Eval()%> bindings cause errors for the gridview the event will not fire. I corrected my errors and now the event fires.

thanks for all of your help again.

[mendhak]

<%# %> is an evil curse placed within the domain of ASP.NET by Lucifer himself to lure naive programmers. Use the events provided with the gridview and you won't have problems. The event corresponding to that is the RowDataBound event.