Handle 'Enter' event in ASP.NET

Problem:

I have two form, search form and login form.

1. When i keyin username and password and hit enter in Mozilla Firefox. The search form will be trigger.
2. When i keyin a search key in search key form, validator for login form will be trigger

Form details:

1. Search form:
• 1 textbox
• 1 button
2. Login form:
• 2 textbox
• 2 validator
• 1 image button

To solve the problem:

1. Add a panel with defaultbutton for both form.
   
   <asp:Panel ID="pnlLogin" runat="server" defaultbutton="IbtnLogin">
   <asp:TextBox ID="username" runat="server"></asp:TextBox>
   <asp:TextBox ID="password" runat="server"></asp:TextBox>
   <asp:ImageButton ID="IbtnLogin" runat="server" ImageUrl="~/img/LoginButton.gif" OnClick="IbtnLogin_Click" />
   </asp:Panel>
   
   
2. Set RequiredFieldValidator Enabled = false
   
   <asp:RequiredFieldValidator ID="vdtUsername" runat="server" ErrorMessage="Enter username" ControlToValidate="username" Enabled="False"></asp:RequiredFieldValidator>
   <asp:RequiredFieldValidator ID="vdtPassword" runat="server" ErrorMessage="Enter password" ControlToValidate="password" Enabled="False"></asp:RequiredFieldValidator>
   
   Enable the RequiredFieldValidator in IbtnLogin_Click
   IbtnLogin_Click(object sender, ImageClickEventArgs e)
   {
   vdtUsername.Enabled = true;
   vdtPassword.Enabled = true;
   .......................................................
   .......................................................
   .........................................
   }
   

problem solved!