Performing button click from textbox enter in VB.NET

Hello,

I have a login box in my application - which has a username textbox, a password textbox and a Submit button.

I want the login subroutine to fire whether the user presses the Submit button, or if the user has the focus in the password textbox and presses enter.

Initially, I had coded it as follows (had 2 different handlers - one for the button and one for the textbox - both pointing back to the same subroutine)

    Sub LoginProc(sender As Object, e As System.EventArgs)
        
        ' Login by pushing the LOGIN button
        LoadPermissions(usernameTextbox.Text, passwordTextbox.Text)

    End Sub
    
    Sub LoginProc1(ByVal Source As Object, ByVal E As EventArgs)
   
        ' Login by pushing ENTER
        LoadPermissions(usernameTextbox.Text, passwordTextbox.Text)

    End Sub
    
    Sub LoadPermissions(ByVal Username As String, ByVal Password As String)
  
      .... Do my stuff here ...

    End Sub

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with the associated HTML:

<asp:TextBox ID="passwordTextbox" runat="server" OnTextChanged="LoginProc1" autopostback="true" Width="44" TextMode="Password" />
<asp:Button runat="server" id="loginsubmitButton1" OnClick="LoginProc" class="formbutton" />

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Realize now that that has been crappy code and everytime I login (still don't know why) both handlers are automatically invoked and the LoadPermissions subroutine is fired twice.

How can I clean up my code to just fire LoadPermissions once with one handler that works for both pushing the button, and using the ENTER button while the textbox is in focus ?

Thanks, Peter