prepopulate textbox with variable, asp.net

Question

Hi, i'd like to prepopulate my textfield with the following variable <%=Membership.GetUser().Email%> so that users can submit their email address to my table without having to type it in. THanks!

---- here's my form code----

    <form id="form1" runat="server">
    <div>
    <!-- This is the code for the form. There is a Text Box to collect the first name, 
    last name and email address. All fields are required and I am validating that the 
    email address is a valid format. -->
    <asp:Table ID="Table1" runat="server">

    <asp:TableRow><asp:TableCell>First Name: <asp:TextBox ID="txtFirstName" 
    runat="server" Width="60" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" 
    ErrorMessage="Enter First Name" Text="*" ControlToValidate="txtFirstName" 
    runat="server" /> </asp:TableCell>

    <asp:TableCell>Last Name: <asp:TextBox ID="txtLastName" runat="server" Width="60" /> 
    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" 
    ControlToValidate="txtLastName" ErrorMessage="Enter Last Name" Text="*" />
    </asp:TableCell> </asp:TableRow>
    <asp:TableRow><asp:TableCell>Email: <asp:TextBox ID="txtEmail" 
    runat="server" Width="80" /><asp:RequiredFieldValidator ID="emailRequired" 
    runat="server" ControlToValidate="txtEmail" ErrorMessage="Email Needs Information" 
    Text="*"/> <asp:RegularExpressionValidator ID="emailexpression" 
    runat="server" ControlToValidate="txtEmail" ValidationExpression=".*@.*\..*" 
    ErrorMessage="Invalide Email Address" Text="*" /></asp:TableCell></asp:TableRow>
    <asp:TableRow><asp:TableCell>
    <asp:ValidationSummary ID="ValidationSummary1" runat="server" ShowSummary="true" 
    ShowMessageBox="true" runat="server" />
    </asp:TableCell></asp:TableRow>
    <asp:TableRow>
    <asp:TableCell><asp:Button ID="btnSubmit" runat="server" OnClick="addMember" 
    CausesValidation="true" Height="30" Width="100" Text="Add Me" />
    </asp:TableCell></asp:TableRow>
    <asp:TableRow><asp:TableCell><asp:Label ID="lblDuplicate" runat="server" Text="">
    </asp:Label></asp:TableCell></asp:TableRow>
    </asp:Table>
    </div>
    </form>

Answer 1

Pop it in the page load event in the code-behind?

if (!Page.IsPostBack)
{
    txtEmail.Text = Membership.GetUser().Email;
}