避免在C#中重复数据

问题描述

大家好.

我有一个名为PlateSerial的文本框，我插入了唯一的序列号.这不是自动生成的.插入序列号后，它将被带入NumberPlate数据库.

我想要的是，如果我放置一个已经插入数据库的序列号.它不应该允许我这样做.

那我该怎么做.

请帮忙.另外，如果可能的话，我更喜欢代码示例.

谢谢大家

Hello everyone.

I have a textbox called PlateSerial were i insert unique serial numbers. This is not auto generated. Once the serial is inserted it is taken to the NumberPlate database.

What i want is that if i put a serial that has already been inserted in the database. It should not allow me to do so.

So how do i do this.

Please help. In addition if possible i would prefer code examples.

Thanks everyone

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