I have a hidden asp Button in a Repeater. In the VB.NET code behind I use the Rerpeater_ItemCommand to get the click event within the Repeater. There's a check if user is already recording a project. If yes and he wants to start a new one, a confirm box should appear asking "Are you sure?" How can I access the click value from confirm?

<asp:Repeater ID="Repeater1" runat="server" OnItemCommand="Repeater1_ItemCommand">
        <ItemTemplate>

        <div class="tile user_view user_<%# Eval("employeeName") %>">
        <div class="tilesheight"></div>
        <div class="element">

        <asp:Button ID="Button1" CssClass="hiddenbutton" runat="server" /> 


            Index: 
            <asp:Label ID="Label1" runat="server"
                Text='<%# Eval("index") %>' /><br />
            <hr class="hr" />

            customer:
            <asp:Label ID="CustomerLabel" runat="server" 
                Text='<%# Eval("customer") %>' /><br />
            <hr class ="hr" />
            order:
            <asp:Label ID="OrderNoLabel" runat="server" 
                Text='<%# Eval("orderNo") %>' /><br />
            <asp:Label ID="DescriptionLabel" runat="server" 
                Text='<%# Eval("description") %>' /><br />
            <hr class="hr" />

        </div>
        </div>
        </ItemTemplate>
        </asp:Repeater>

code behind:

If empRecs.Contains(projects.Item(index.Text).employeeID) Then

            'Catch index of recording order
            i = empRecs.IndexOf(projects.Item(index.Text).employeeID)


                Page.ClientScript.RegisterStartupScript(Me.GetType, "confirm", "confirm('Order " & empRecs(i + 2) & " already recording. Would you like to start a new one?')",True)

                'If users clicks ok insertData()

        End If

Other solutions are using the Click Event and a hidden field. But the problem is, I don't want the confirmbox to appear every time the button is clicked. Only when empRecs conatins an employee.

Thanks for helping