数据库名称的读取

//将数据库的名称独取出来
    public void bindDropDown() {
       //以下这条sql语句我很奇怪，就是一定要添加master..sysdatabases才行，要是直接 写sysdatabases这样会报错，说找不到表
        string sql = "select [name] from master..sysdatabases where [name] not in('master','tempdb','model','msdb')";
        DataQueryHelper qhelper = new DataQueryHelper();
        DataTable dt= qhelper.getDataView(sql).Tables[0];
        ddlBackupDb.DataSource = dt.DefaultView;
        ddlBackupDb.DataValueField = "name";
        ddlBackupDb.DataTextField = "name";
        ddlBackupDb.DataBind();
        ddlBackupDb.Items.Insert(0,new ListItem("请选择数据库"," "));
    }