textbox loses value after page load

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VB

ASP.NET

Javascript

i made asp text box

<asp:TextBox ID="comfirmVal" runat="server" class="confirmElm"></asp:TextBox>

and by javascript i put value for it in condition

$(".delList").click(function () {
                if (confirm('Are you sure you want to Delete This List?')) {
                    document.getElementById("comfirmVal").value = 1; //1 for yes delete
                } else {
                    document.getElementById("comfirmVal").value = 2; //2 for no
                }
            });

i want check text box value in my vb code

If comfirmVal.Text = value.ToString Then
                    deleteList(fullPath)
End If

but comfirmVal.Text is empty is loses the value after page load

any help ?