If you create your table using a script in a pass-through query, don't forget to add the primarey key, example script with PK added:
Code:
USE [TSQL_NGA]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[tblTest](
[testID] [bigint] IDENTITY(1,1) NOT NULL,
[testNr] [int] NOT NULL,
[testText] [nvarchar](50) NULL,
CONSTRAINT [PK_tblTest] PRIMARY KEY CLUSTERED
(
[testID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO