1、SQL Server

<add name="ApplicationName" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true"

providerName="System.Data.SqlClient" /> 

<add name="ApplicationName" connectionString="Data Source=.;Database=Test;User=sa;Password=sa;MultipleActiveResultSets=True" 

     providerName="System.Data.SqlClient"/>

 2、SQL Server Compact

<add name="TestContext" connectionString="Data Source=|DataDirectory|\Test.sdf" providerName="System.Data.SqlServerCe.4.0"/>

3、MySql

<add name="TestContext" connectionString="server=localhost;User Id=root;password=sa;database=test" providerName="MySql.Data.MySqlClient" />

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