Generating dynamix controls when clicked on Button

Hi everyone..
I am new to .net
I am working on an application where, when a user clicks on a button named AddMore dynamic Label and Textbox must to be generated.
And when clicked again, another set of label and textbox must be generated..
Could anybody hep me out...
markUp is

<%--New Question--%>
<tr>
<td>
<asp:Label ID="lblNewQuestion" runat="server" Text="New Question"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtNewQuestion" Width="300" runat="server"></asp:TextBox>
</td>
</tr>
<%--QuestionType--%>
<tr>
<td>
<asp:Label ID="lblQuestionType" runat="server" Text="QuestionType" / ...