Description: this procedure is not a complete system, it only provided a simple login function, It is my elective teachers to stay in operation, Published revenue and the reason is to allow the beginners C# can be faster songs, or the right to understand the three-tier friends some reference. It is made of VS.NET 2005 to prepare the source structure clear, and with the Notes. Believe they can just learn C# and would like to know the three-tier system to help students.
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