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Cannot open database "ASPState" requested by the login. The login failed. Login failed for user 'xxxx'

I am working on one project which is in Asp.Net web form and Sql server. When I run application I get the error Unable to connect Sql Server Session Database and inner exception is Cannot open database ASPState requested by the login.
I did some google search to fix this issue. I don't have sa password so i cannot logged in as sa to assign privileges to ASPState database for the newly created User.
I don't see any ASPState database on Sql Server when i logged in. So i thought I might need to run aspnet reg exe on my machine. So i tried to run aspnetreg_regsql.exe but i got the following error.
An error occurred during the execution of the SQL file
'InstallCommon.sql'. The SQL error number is 5170 and the SqlException
message is: Cannot create file 'C:\Program Files\Microsoft SQL
Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\aspnetdb.mdf' because it
already exists. Change the file path or the file name, and retry the
operation.
CREATE DATABASE failed. Some file names listed could not be created. Check related errors.
Creating the aspnetdb database...
I am totally blank now to solve this issue, I will really appreciate your suggestion for this. This issue hold to publish on production.

Dont think that there is a simple answer to this with the permissions that you have, I think that what has happened is that the database HAS been created, but the user you are using does not have any access to it at all.
Without having an administrators credentials I dont think that you will be able to resolve the problem.
You can however work around it by re-creating the database with a different name:
aspnet_regsql -d[YourNewDBName] -RestOfYourParamaters
That should allow you to re-run the creation script, however there is no guarantee that you wont end up with the same issue on the newly created database.

You should issue the command DROP DATABASE aspnetdb and then re-run your script.

'InstallCommon.sql' surely ain't any database. It must be a script that installs a new Database, as the name suggests. Run the script, and then link the generated database

Can't access SQL database

I'm working on a project and now I had to switch account on the computer from local to a account on a domain and thus the windows authentication changed. So I made a new login and it works on the account that is on the domain, but when I change the connection string from
Data Source=productie3;
to
Data Source='MEVO/productie3';
//tried with either \ or /
//direct connection (using SQL Server Management Studio) to the database using the
//windows authentication works fine
I tried it without the single quotes as well,
But it still doesn't work.
I've used this to allow remove access
USE [DB name];
GO
EXEC sp_configure 'remote access', 0 ;
GO
RECONFIGURE ;
GO
But it still won't allow it to connect, if anyone knows what I'm doing wrong please tell me. I'm using Microsoft SQL Server Management Studio for the database.

Try connecting with a backslash. You are putting in a forward slash.
Data Source='MEVO\productie3';

C# creating a database programmatically with SMO

I am trying to create a database, but once created, I cannot connect to it.
The server is Microsoft SQL Server 2008 and using .Net 4.5. We're creating the database with SMO, but we're usually using Dapper to connect and query the database.
This is the code I have so far, which works :
System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(connectionString);
Microsoft.SqlServer.Management.Smo.Server srv = new Microsoft.SqlServer.Management.Smo.Server(new Microsoft.SqlServer.Management.Common.ServerConnection(con));
var database = new Microsoft.SqlServer.Management.Smo.Database(srv, dbName);
database.Create(false);
database.Roles["db_datareader"].AddMember(???);
database.Roles["db_datawriter"].AddMember(???);
database.Roles["db_backupoperator"].AddMember(???);
srv.Refresh();
Noce the ??? ? I have tried
System.Environment.UserDomainName + "\\" + System.Environment.UserName
and
System.Environment.UserName
but it fails (update) with the error Add member failed for DatabaseRole 'db_datareader'. with both values.
The problem is that when I create the database, I cannot coonect to it for some reason (using Dapper), from the same program. (update) I get the error message : Cannot open database \"<database_name>\" requested by the login. The login failed.\r\nLogin failed for user '<domain>\\<username>' (where <database_name> is the database name, <domain> my logon domain, and <username> my Windows logon).
Am I missing something? Am I doing th right thing? I've tried searching the web, but it seems no one creates database this way. The methods are there, it should work, no?
** Update **
If I comment the database.Roles["..."].AddMember(...) lines, and I add a break point at srv.Refresh(), resuming the program from there solves everything.
Why a break point solves everything? I can't just break the program in production... nor break the program when creating the database everytime.

It sounds like the Dapper connection issue is a problem with SQL Server doing some of the SMO operations asynchronously. In all likelihood, the new Database is not ready for other users/connections immediately, but requires some small time for SQL Server to prepare it. In "human-time" (in SSMS, or a Breakpoint) this isn't noticeable, but "program-time" it too fast, so you probably need to give it a pause.
This may also be the problem with the Role's AddMember, but there a a number of things that could be wrong here, and we do not have enough information to tell. (specifically, does AddMember work later on? and are the strings being passed correct or not?)

This is happening because you've created the user, but no login for that user. Though I don't know the exact syntax, you're going to have to create a Login. You'll want to set its LoginType to LoginType.WindowsUser. Further, you'll likely need to set the WindowsLoginAccessType to WindowsLoginAccessType.Grant and you'll need to set the Credential by building one, probably a NetworkCredential with the user name you want.
To put a visual on this, the Login is under the Security node for the Server in Management Studio whereas the User is under the Security node for the Database. Both need to exist for access to the SQL Server.

User does not exist in MySQL , c# and asp.NET MVC

I am working on development machine without making any user account [i have three of four account who comes when i installed them].
so i open the connection everywhere by a globals variable who hold the connectionstring off-course value of variable can not be changed it's constant.
i open the connection using root account who come by default in mysql server. they work fine everywhere.
but my code try to run a command then server return the error that
The user specified as a definer ('admin'#'localhost') does not exist
i don't know why i got this error even in debug i found that connection open by root and they work fine everywhere else.
so the problem is why they tell me about admin#localhost even the connection my code open by root.
are their anything my code try to do who need authentication or need admin account even they not have then give me exception.
Are you know that what is gone wrong.

I got this error after DB was moved to another server.
There no such user 'admin' so I got the error.
Solution:
log into mysql as root
grant all on *.* to admin#localhost identified by "s!5_superp#ss!";
flush privileges;

Cannot Connect to Sql Server Enterprise On Local Machine

I have SQL Server 2008 Enterprise edition, and C# code that should connect to said server. It's a local server on my computer and when I try to log on I get this error:
Cannot open database "Clients" requested by the login, the login failed.
Login failed for user crmsys.
This user has the right permissions, this server is even configured to allow remote connections and through the management studio I can access as this user.
Here's my connection string:
Data Source=./; Initial Catalog=Clients;user ID=crmsys;Password= Password;

In your snippet of configuration settings in your initial post there is a space between the equals sign and the first character of the password - is this correct?

i'm not sure "./" is a valid datasource. I always use "localhost" or ". \ [instancename]"
just an idea.

Make sure you dont have a firewall blocking you; the windows one does by default... If thats all ok check remote connections are enabled: From management studio Check Properties, Connections, and check "Allow Remote Connections To This Server" is checked.
If that is checked then restart SQL Server and try again; if it still fails check that TCP/IP is enabled and the settings using the Configuration Manager.

Are you sure the crmsys user has permission to connect to the database?
If you right-click the "Clients" database entry in SSMS, then go to "Properties" -> "Permissions", then select the "crmsys" user from the "Users or roles" pane, and then click the "Effective" tab, can you confirm that the "CONNECT" permission is there?
Edit: it should look like the image below:
alt text http://img42.imageshack.us/img42/4696/ssms.png

Have you tried Server=.\sqlexpress;Database=Clients;Uid=crmsys;Password=Password;Integrated Security=false

Solved it!!!!!! that was very weird but guess it turned out to be a conflict in the db properties, it's mixed out with the previues user which was crmsys(on the first computer) and when i restored it into my computer i made allready a user name crmsys - delete the user from the DB, deleted the Login crmsys, restored it and then opened a new user with the same permissions, and that it! Thanks you all for helping me figuring it out!