database does not exist

Where you have mentioned in the connectionstring information.Because, after installing your application, I couldn't see app.config file. I guess, you might hard-coded it.
Please add app.config file and read the connection string information from app.config file.

After installing the application in your system, the database informations are same or it is different ?

I have reflected your code, the connectionstring says "SqlConnection cn = new SqlConnection("Data Source=.; Initial Catalog=login_control; User ID=sa; Password=123456");".
So, after installing the application in another system, when you use "." it will connect the local database server on that system.
Please change your connectionstring something like

SqlConnection cn = new SqlConnection("Data Source=<DB Server>; Initial Catalog=login_control; User ID=sa; Password=123456");

Hope this helps you.

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14y ago
Accepted answer
Where you have mentioned in the connectionstring information.Because, after installing your application, I couldn't see app.config file. I guess, you might hard-coded it.
Please add app.config file and read the connection string information from app.config file.

After installing the application in your system, the database informations are same or it is different ?

I have reflected your code, the connectionstring says "SqlConnection cn = new SqlConnection("Data Source=.; Initial Catalog=login_control; User ID=sa; Password=123456");".
So, after installing the application in another system, when you use "." it will connect the local database server on that system.
Please change your connectionstring something like
```
SqlConnection cn = new SqlConnection("Data Source=<DB Server>; Initial Catalog=login_control; User ID=sa; Password=123456");

Hope this helps you.
```
praveen maurya14y ago
hello there i correct the mention problem now my app,ication is runing well but when i am updating my databse it show read only