The ConnectionString property has not been initialized

Hi, I am using Microsoft.Practices.EnterpriseLibrary.Data is my class to create connection to oracle database. here it is:
database db = new database();
cmd = db.GetSqlStringCommand(strSQL.ToString()); db.ExecuteDataSet(cmd);

And getting error :  The ConnectionString property has not been initialized
web.config :
<connectionStrings> <clear/> <add name="test" connectionString="Data Source=test; User ID=test; Password=test;Pooling=true;Min Pool size=0;Max Pool Size=50;" providerName="System.Data.OracleClient"/> </connectionStrings>

Help please!!!!!