Unable to cast object of type 'System.DBNull' to type 'System.String'
Posted by: naren gokal
Date: March 11, 2012 03:29PM

Hi,

I am using MVC3 ASP, and have configured my web.config file to login into the MYSQL DB as root. I have created many stored procedures which i can connect fine with. i now want to change this login user to a public user, called tempuser and NOT root anymore.

However, when i change the login user from "root" to "tempuser", i get the error:
Unable to cast object of type 'System.DBNull' to type 'System.String'

i get the above error at the execution of ExecuteNonQuery().

I have granted access to the functions by:
GRANT EXECUTE ON FUNCTION check_user_exists to tempuser@'%';

I have also granted 'select' and 'update' on this table that im accessing which the function uses. I can login to mysql command line as tempuser and call the function manually with no problems. But when i run ExecuteNonQuery() i get the above error. I am currently using Visual Web Developer 2010, Razor Engine, MVC3.

ANy help, please.

I have been trying for weeks now with no luck.

thanks
Naren

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