Database Server - SQL Access: Cannot connect from code but from SSMS

Question

Hi,
I am using following connection string in my asp.net web.config:
[Less than symbol] add name="FMMConnectionString" connectionString="Data Source=xxxxxxxxx,1234;Initial Catalog=Test1Db;User Id=Rajeev;Password=xxxxxxxxxxxxx;" providerName="System.Data.SqlClient" [Slash][Greater than symbol]
The database is on remote database server. The sql user/ developer 'Rajeev' is deliberately given restricted permissions (to protect our schema) using following sql commands:
GRANT ALTER,EXECUTE, SELECT,INSERT,UPDATE,DELETE ON SCHEMA ::dbo TO Rajeev
DENY VIEW DEFINITION ON SCHEMA::dbo TO Rajeev;
GRANT CREATE PROCEDURE TO Rajeev;
GRANT CREATE FUNCTION TO Rajeev;
DENY ALTER ON SCHEMA::dbo TO Rajeev; -- To disallow Rajeev to create objects on dbo schema but only create in Rajeev schema while still being able to select, insert, execute on dbo schema. 
The above connection string works perfectly fine when used from Visual Studio> Server Explorer. I am able to execute following sql queries without issues. Same is true when using SQL Server Management Studio using Rajeev credentials.
select top 100 * from XYZEmployees
execute usp_GetMMBSchemeDetails '1' 
The error I get in web page is following:
The stored procedure 'usp_GetMMBSchemeDetails' doesn't exist.
When I ran code using breakpoints to see what is happening, I see that when connection object is being instantiated, the connection state is being closed with following error:
at System.Data.SqlClient.SqlConnection.GetOpenConnection()
at System.Data.SqlClient.SqlConnection.get_ServerVersion()
I turned off my firewall to see if it was blocking but it did not help. I tried using Visual Studio 2012 as well as Visual Studio 2013 but same issue showed up.
Kindly let me know why I am able to execute sql queries from SSMS and Visual Studio's Server Explorer but not from application code. Is there something that needs to be enabled on remote database server so that the queries can run from code? I like to create
more users like Rajeev with restricted permissions to develop my application. So kindly provide a solution if you know.
Thanks,
Pullet

Answer 1

Thanks Everyone for your insights :) 
RSingh, Your approach works when using SSMS, not when called from application code (example: asp.net code-behind page calling a stored proc using connection object).
My requirement is, I only wanted developer to do front end programming without having the ability to look at backend sql objects definitions. He/she can call the sql objects in the program as needed. 
I am able to finally solve this requirement by following approach. Hope it helps others. 
1. Right-click Rajeev user in Database> Security>Users and unselect 'dbowner' from 'General' tab> 'Database Role Membership' section even though Default Schema shows up as Rajeev schema. Now, this user can't do anything on dbo schema of database
(as well as in any other user's schema in this database).
2. Ran above commands but excluded following command which was identified as root-cause.
DENY VIEW DEFINITION ON SCHEMA::dbo TO Rajeev;
3. Now ran a script that denies 'view definition' of dbo schema's tables. It loops through all tables and denies 'view definition' on each table. Adapted the script of http://blog.extreme-advice.com/2013/01/23/grant-view-defination-permission-to-all-stored-procedures-in-sql-server/.
Now, the user Rajeev can execute dbo schema objects both from SSMS as well as from application code.
4. DENY EXECUTE, SELECT ON SCHEMA::INFORMATION_SCHEMA TO Rajeev; -- Restricts Rajeev from executing INFORMATION_SCHEMA objects seen in SSMS.
However one remaining open item is, I could not hide the system objects (which are part of sys schema) in SSMS. Ideally, I do not want Rajeev to execute the 'system views', 'system stored procedures', etc. When I execute same command (below command), it
runs without errors but does not apply this restriction.
DENY EXECUTE, SELECT ON SCHEMA::sys TO Rajeev;
If you know the reason why it is happening like this, please kindly share.
Cheers,
Pullet
Cheers | Pullet