Three-tier architecture using a simple interface to do to achieve

Myteach
.......\MyTeach.Business
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.......\................\MyTeach.Business.csproj
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.......\................\Properties
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.......\................\StudentBiz.cs
.......\Myteach.Client
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.......\..............\Myteach.Client.csproj
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.......\..............\..........\...........\MyTeach.Model.StudentInfo.datasource
.......\..............\..........\Resources.Designer.cs
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.......\..............\..........\Settings.Designer.cs
.......\..............\..........\Settings.settings
.......\..............\StuDBDataSet.Designer.cs
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.......\..............\StuDBDataSet1.xss
.......\..............\StudentForm.cs
.......\..............\StudentForm.Designer.cs
.......\..............\StudentForm.resx
.......\MyTeach.DataAccess
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.......\..................\MyTeach.DataAccess.csproj
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.......\..................\Program.cs
.......\..................\Properties
.......\..................\..........\AssemblyInfo.cs
.......\..................\SQLHelper.cs
.......\..................\StudentDao.cs
.......\MyTeach.Model
.......\.............\bin
.......\.............\...\Debug
.......\.............\MyTeach.Model.csproj
.......\.............\obj
.......\.............\...\Debug
.......\.............\Program.cs
.......\.............\Properties
.......\.............\..........\AssemblyInfo.cs
.......\.............\StudentInfo.cs
.......\Myteach.sln

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