103010大雨如千般烦忧，化作珠帘滑落，覆盖着九王子的绿脸。虽然小程序还年轻，但他明亮的大眼睛里有着不属于这个年龄的绝望。
I have a system with 3开发者_如何学C layers and I am using LINQ-to-SQL to persist. I want to validate if the description field of my object is empty. I am using partial classes and the method OnVali
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