At a guess - and I haven't got any access to your database so I can't check - you are trying to create a database in code that tries to connect to it. That won't work, not unless the DB already exists, and the error message would indicate it doesn't.
What you need to do is connect to the database engine without specifying a DB to use.
At the moment your connection string specifies a DB:
Data Source=Computech-PC\SQLEXPRESS;Initial Catalog=SQLSqript;Integrated Security=true;User ID=sa;Password='' providerName=System.Data.SqlClient"
\_______________________/
DB
Use String.Replace to remove that section and it should start to work, but you probably need to sort out the authorization - Integrated Security and a username and password is unusual, and you probably don't want the ProviderName section at all.