Previously for all our asp.net applications we have been using a sysadmin user within SQL Server to connect and add/update/delete/get data. Our SQL Admin wants to delete tha
Yes, try this:
Data Source=server;Initial Catalog=database;Integrated Security=SSPI;
This specifies that you wish to use integrated Windows authentication where you were still trying to use SQL Server authentication (even though the username you entered looked like a Windows domain / user account SQL server still treats it as standard SQL Server authentication)
Also take a look at connectionstrings.com