C# about textbox s autocomplete

autocomplete\0721\0721.csproj
............\....\0721.csproj.user
............\....\app.config
............\....\bin\Debug\0721.exe
............\....\...\.....\0721.exe.config
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............\....\...\.....\0721.vshost.exe
............\....\...\.....\0721.vshost.exe.config
............\....\...\.....\0721.vshost.exe.manifest
............\....\DB.cs
............\....\Form1.cs
............\....\Form1.Designer.cs
............\....\Form1.resx
............\....\Form2.cs
............\....\Form2.Designer.cs
............\....\Form2.resx
............\....\Form3.cs
............\....\Form3.Designer.cs
............\....\Form3.resx
............\....\Form4.cs
............\....\Form4.Designer.cs
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............\....\Form5.cs
............\....\Form5.Designer.cs
............\....\Form5.resx
............\....\obj\Debug\0721.csproj.FileListAbsolute.txt
............\....\...\.....\0721.csproj.GenerateResource.Cache
............\....\...\.....\0721.exe
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............\....\...\.....\_0721.Form1.resources
............\....\...\.....\_0721.Form2.resources
............\....\...\.....\_0721.Form3.resources
............\....\...\.....\_0721.Form4.resources
............\....\...\.....\_0721.Form5.resources
............\....\...\.....\_0721.Properties.Resources.resources
............\....\Program.cs
............\....\...perties\AssemblyInfo.cs
............\....\..........\Resources.Designer.cs
............\....\..........\Resources.resx
............\....\..........\Settings.Designer.cs
............\....\..........\Settings.settings
............\0721.sln
............\0721.suo
............\....\obj\Debug\Refactor
............\....\...\.....\TempPE
............\....\bin\Debug
............\....\...\Release
............\....\obj\Debug
............\....\...\Release
............\....\bin
............\....\obj
............\....\Properties
............\0721
autocomplete

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