Why Do I Get Acess Denied

Hello.





Im trying to insert data in a sql-table using a SP.


But it wont work!





here's my connectionstring (established in Page_Load()):





sqlconCon = new SqlConnection("server=localhost;database=dbJonas;Trusted_Connection=Yes");





and it executed like this (in a OnServerClick-eventhandler):





SqlCommand sqlcmdInsertNewsArticle = new SqlCommand(insertCmd, sqlconCon);


...


filling with parameters


...


sqlcmdInsertNewsArticle.Connection.Open();








The error I get point to the Connection.Open()-line and says :


System.Data.SqlClient.SqlException: SQL Server does not exist or access denied.





does anyone know what I may have done wrong?





I have other connections to the server that works fine (Select-statements though)





anyone? thankful for tips...