Compiler Error Message: CS0103: The name 'EmailTB' does not exist in the current context
                            
                         
                        
                     
                 
                
                    I am using a ListView control to display an Email value in the EmailTB text control as shown here
<div class="form_right_view">
                <asp:Label ID="EmailTB" runat="server" Text='<%# Eval("Email") %>' CssClass="" Font-Bold="true"></asp:Label>      
               </div>
I also wanted to use the value of the EmailTB.text in the code behind as follows 
if (EmailTB.Text != " ")
        {
            string Username = Membership.GetUserNameByEmail(EmailTB.Text);
        }
But I am getting Compiler Error Message: CS0103: The name 'EmailTB' does not exist in the current context.
Thanks