run this query on a Method
SELECT [name]
FROM master.dbo.sysdatabases
WHERE dbid > 4
or by
String connString ="Data Source=localhost;User ID=username;Password=passwrd;";
using (SqlConnection sqlConn = new SqlConnection(connString))
{
sqlConn.Open();
DataTable tblDatabases = sqlConn.GetSchema("Databases");
sqlConn.Close();
DataTable td = tblDatabases.Select("dbid>6").CopyToDataTable();
}