I have a Login Page where Instead of a text box for User Names, I have a dropdownlsit containning the list of users( thats becauseI have a limited & fiexed no. of users)
The DropDownList is the First Control of the Page.
Then there is a textbox for filling in Password.
And Finally a Button for Logging in.

When A User Selects his username from the list , Fills in his password in the Textbox and Presses Enter Nothing happens.

Instead Of Pressing Enter if he presses tab and Shifts the focus to the Button and then Pressses Enter, Everything works Fine.

Is there any way that the Login is executed when Enter is pressed in the first case

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The problem is that when you press enter in the password box, you aren't pressing the button. Presumably you are performing the login action when you click the button.

You might try having the login process happen when the password textbox "OnChange" event fires. Seeing as this is a password box (and always starts out blank), the OnChange event should always fire (I hope).

Otherwise you could trap the enter key on the password box. There is a recent thread about this.