How to get string length in for loop of aspx page

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C#

ASP.NET

i required string length to use in aspx page using for loop. This string length will be calculate the database values count from code behind and that value will be retrieved to aspx page for for loop condition. how to achieve this please anybody give me suggestion. But i am getting error saying: The name 'count' does not exist in the current context.

What I have tried:

<asp:UpdatePanel ID="upQuestionsAndChoiceTabPanel" runat="server">
    <ContentTemplate>
        <cc1:TabContainer ID="OnlineTestTab" runat="server" AutoPostBack="true" ActiveTabIndex="1">
            <% for (int i = 0; i < count.Length; i++)
            { %>
                <cc1:TabPanel></cc1:TabPanel>
            <%} %>
        </cc1:TabContainer>
    </ContentTemplate>
</asp:UpdatePanel>

In code behind:
public string count;
This count will bind data from database in page_load event. That count length i require anybody please help me