Asp.net - Add Data To Gridview, From Textbox, On Button Click?

I am working on an aspx site that lets an admin-level user fill out a form with potential member data. Once the form is filled out, the user will click submit and the data will go off to different tables. One part of the form that is stumping me involves filling out three textboxes (txtFirstName, txtLastName, txtGrade). I have a button (btnAddStudent), that, when clicked, should add the information from the textboxes to a table-like display area. I am trying to use a gridview, but there is nothing to bind it to. There is no memberID number to load a blank record from the Student table (which is a many-to-one relation to Member table). The member record is what this form is creating, and the student data will be added to the Student table when the Submit button is clicked.

I am currently working with the code found in the reply here. But when I click the "Add Student" button, I get a new blank row, but my textbox values are not inputted in the gridview.

Can this work, or do I need to look at using a table and adding rows of textboxes dynamically?

Here is relevant source code:

<tr>
<td class="style8">
<asp:Label ID="Label18" runat="server" Text="Chidren:" Font-Bold="True" Font- Underline="True" Font-Names="Tahoma"></asp:Label>

[Code]....