将变量添加到服务器标签

Question

尝试将vb.net变量添加到按钮标签。我不知道语法。它说的是commandArgument，我正在尝试引用for循环。

<%For i = 0 To NumElements - 1%>
    <tr>
    <td>
        <b><%Response.Write((IdentityList.Item(i).ReportNumber))%></b>
    </td>
    <asp:Button
        ID="ButtonDetails" 
        runat="server" 
        Text="Details"
        class="button buttonStyle"
        value="Details"
        CommandName="Identity"
        commandArgument="<%i%>"
        OnCommand="ButtonDetails_Click"
    />
    </tr>
<%Next%>