C# determine whether the data is a duplicate entry, a practical basis for example, when the user input, to determine the database the existence of the same record, the designated judge duplication of data entry in a field, a little improvement, determine whether the user can be turned into program name and password, open source C# source code download

EstimateDataRepeat\DataBase\db_09_Data.MDF
..................\........\db_09_Log.LDF
..................\EstimateDataRepeat\EstimateDataRepeat.csproj
..................\..................\Form1.cs
..................\..................\Form1.Designer.cs
..................\..................\Form1.resx
..................\..................\Program.cs
..................\..................\...perties\AssemblyInfo.cs
..................\..................\..........\Resources.Designer.cs
..................\..................\..........\Resources.resx
..................\..................\..........\Settings.Designer.cs
..................\..................\..........\Settings.settings
..................\EstimateDataRepeat.sln
..................\EstimateDataRepeat.suo
..................\..................\Properties
..................\DataBase
..................\EstimateDataRepeat
EstimateDataRepeat

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