get rid of microsoft C++ code

for each is not a standard C++.
/**for each (string a in Conn.getDatabaseNames())
		{
			if (EQUAL(_oDB.c_str(),a.c_str()))
			{
				for each(string c in Conn.getCollectionNames(_oDB))
					if (EQUAL(_oCollection.c_str(),c.c_str()))
					{				
						CPLError( CE_Failure, CPLE_IllegalArg, 
						"Failed to create datasource for there is already db named: %s.", 
						pszName );
						return FALSE;
					}
			}
		}**/