I Have VS2005 Professional Edition and SQL Server Developer Edition, When I Tried to Connect to The Web Administration Tool on My Website Project to Do Some Login Process, And When I Pressed The Security Tab The Following Message Appears:

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There is a problem with your selected data store. This can be caused by an invalid server name or credentials, or by insufficient permission. It can also be caused by the role manager feature not being enabled. Click the button below to be redirected to a page where you can choose a new data store.

The following message may help in diagnosing the problem: Unable to connect to SQL Server database.
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Then I Do Press to The Following Links and The Following Message Appears :

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Could not establish a connection to the database.
If you have not yet created the SQL Server database, exit the Web Site Administration tool, use the aspnet_regsql command-line utility to create and configure the database, and then return to this tool to set the provider
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So, If There is any Help or Reference to Solve This Problem !!!

I'm Waiting