Write a login procedure: Enter the user name and password, click " Login" button, the program automatically and study users table data for comparison, the three cases were given the appropriate message:

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........\an_ch06_1
........\.........\Form1.Designer.cs
........\.........\Form1.cs
........\.........\Form1.resx
........\.........\Program.cs
........\.........\Properties
........\.........\..........\AssemblyInfo.cs
........\.........\..........\Resources.Designer.cs
........\.........\..........\Resources.resx
........\.........\..........\Settings.Designer.cs
........\.........\..........\Settings.settings
........\.........\an_ch06_1.csproj
........\.........\bin
........\.........\...\Debug
........\.........\...\.....\an_ch06_1.exe
........\.........\...\.....\an_ch06_1.pdb
........\.........\...\.....\an_ch06_1.vshost.exe
........\.........\...\.....\an_ch06_1.vshost.exe.manifest
........\.........\obj
........\.........\...\Debug
........\.........\...\.....\DesignTimeResolveAssemblyReferences.cache
........\.........\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
........\.........\...\.....\TempPE
........\.........\...\.....\......\Properties.Resources.Designer.cs.dll
........\.........\...\.....\an_ch06_1.Form1.resources
........\.........\...\.....\an_ch06_1.Properties.Resources.resources
........\.........\...\.....\an_ch06_1.csproj.FileListAbsolute.txt
........\.........\...\.....\an_ch06_1.csproj.GenerateResource.Cache
........\.........\...\.....\an_ch06_1.exe
........\.........\...\.....\an_ch06_1.pdb
........\an_ch06_1.sln
........\an_ch06_1.v11.suo

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