Creating Custom Web Control - asp.net

Question

I'm trying to create a custom web control, but I have limited experience with Web Forms. How do I access the text passed in between the open an close tags? The control should work like the this.
Usage
<asp:YesOrNoQuestion>Are you above the age of 18 ? </asp:YerOrNoQuestion>
Control
<tr id="trQ6CA" runat="server" visible="false">
<td>
<asp:Label ForeColor="Black" ID="QuestionLabel" runat="server">
// Question Goes Here
</asp:Label>
</td>
<td>
<asp:RadioButtonList ID="buttonCollection" runat="server" RepeatDirection="Horizontal">
<asp:ListItem Value="Y">Yes</asp:ListItem>
<asp:ListItem Value="N">No</asp:ListItem>
</asp:RadioButtonList>
</td>
<td>
<asp:RequiredFieldValidator ControlToValidate="buttonCollection" ID="Requiredfieldvalidator" InitialValue="" runat="server" Text="*" ValidationGroup="vgApplication">
*
</asp:RequiredFieldValidator>
</td>
</tr>
Code I'm Replacing
<tr id="trQ6CA" runat="server" visible="false">
<td valign="top" align="left">
<asp:Label ID="Label10" runat="server" ForeColor="Black">
<b>DOES THE PROPOSED INSURED:</b>
Have a comprehensive health benefits from an insurance policy, an HMO plan, or employer health benefit plan? <br />
If No, persons without such comprehensive coverage are not eligible for this insurance policy.
</asp:Label>
</td>
<td valign="top">
<asp:RadioButtonList ID="rbtQ6S1" runat="server" RepeatDirection="Horizontal">
<asp:ListItem Value="Y">Yes</asp:ListItem>
<asp:ListItem Value="N">No</asp:ListItem>
</asp:RadioButtonList>
</td>
<td valign="top">
<asp:RequiredFieldValidator ID="Requiredfieldvalidator65" runat="server" Text="*" ControlToValidate="rbtQ6S1" InitialValue="" ValidationGroup="vgApplication">
*
</asp:RequiredFieldValidator>
</td>
</tr>

Answer 1

You can choose prefix and tag when you register the control:
https://msdn.microsoft.com/en-us/library/sbz9etab.aspx