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Ok, so I had a image button on the master page that was displaying the sites logo. This was recieving focus and causing a postback to the default.aspx and not completing the login process.
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Thanks spdude your solution did the trick.
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Hello, &nbsp;I have a login control that will not work properly when the login page is displayed in the master page. It works correctly if not using a master page. It will authenticate if the login button is manually clicked but does not work if the keyboard enter button is pressed. It is like it cannot recieve focus. <br />
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Any ideas why?
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Hello,  I have a login control that will not work properly when the login page is displayed in the master page. It works correctly if not using a master page. It will authenticate if the login button is manually clicked but does not work if the keyboard enter button is pressed. It is like it cannot recieve focus. 

Any ideas why?

Ok, so I had a image button on the master page that was displaying the sites logo. This was recieving focus and causing a postback to the default.aspx and not completing the login process.

Thanks spdude your solution did the trick.

login control wont work correctly with masterpage

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications