Read from the database and add to the drop-down list, and can achieve the automatic selection of features relevant records.

dropdown_listbox
................\AssemblyInfo.cs
................\bin
................\...\dropdown_listbox.dll
................\...\dropdown_listbox.pdb
................\DB.cs
................\dropdown_listbox.csproj
................\dropdown_listbox.csproj.webinfo
................\Global.asax
................\Global.asax.cs
................\Global.asax.resx
................\Web.config
................\WebForm1.aspx
................\WebForm1.aspx.cs
................\WebForm1.aspx.resx

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