C# query using the NOT predicate combination of conditions, can be used to query the free rooms and room rates is not between 80-150 rooms, query Room information query idle Room information, this is just an example, which can be extended more features.

NOTFind\DataBase\db_10_Data.MDF
.......\........\db_10_Log.LDF
.......\NOTFind\Form1.cs
.......\.......\Form1.Designer.cs
.......\.......\Form1.resx
.......\.......\NOTFind.csproj
.......\.......\Program.cs
.......\.......\...perties\AssemblyInfo.cs
.......\.......\..........\Resources.Designer.cs
.......\.......\..........\Resources.resx
.......\.......\..........\Settings.Designer.cs
.......\.......\..........\Settings.settings
.......\NOTFind.sln
.......\NOTFind.suo
.......\.......\Properties
.......\DataBase
.......\NOTFind
NOTFind

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Nothing．