C# matching using regular expressions to validate the URL, check the user typed the URL is correct, then the URL information stored in the database, like a URL library, similar to site navigation program, but also to improve a lot of things. In fact, in this case, the regular use of the expression is the most important, learn the regular is very useful.

HttpGuide\DataBase\db_20.mdf
.........\........\db_20_log.LDF
.........\HttpGuide\Form1.cs
.........\.........\Form1.Designer.cs
.........\.........\Form1.resx
.........\.........\HttpGuide.csproj
.........\.........\Program.cs
.........\.........\...perties\AssemblyInfo.cs
.........\.........\..........\Resources.Designer.cs
.........\.........\..........\Resources.resx
.........\.........\..........\Settings.Designer.cs
.........\.........\..........\Settings.settings
.........\HttpGuide.sln
.........\HttpGuide.suo
.........\.........\Properties
.........\DataBase
.........\HttpGuide
HttpGuide

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