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<add name="ConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\grade.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" />
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<add name="sampleConnectionString" connectionString ="server=.\SQLEXPRESS;database=sample;uid=sa;pwd=123456;" providerName ="System.Data.SqlClient"/>
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<add name ="testConnectionString" connectionString ="Data Source=.\SQLEXPRESS;Initial Catalog=sample;Integrated Security=True;Persist Security Info=True;User ID=sa;Password=123456" providerName ="System.Data.SqlClient"/>
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string strCon = System.Configuration.ConfigurationManager.ConnectionStrings["sampleConnectionString"].ConnectionString;
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string strCon = System.Configuration.ConfigurationManager.ConnectionStrings["sampleConnectionString"].ToString();
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string strCon = System.Configuration.ConfigurationManager.ConnectionStrings["testConnectionString"].ToString();
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string strCon = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\grade.mdf;Integrated Security=True;User Instance=True";
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string strCon = "Data Source=.\\SQLEXPRESS;Initial Catalog=sample;Integrated Security=True;Persist Security Info=True;User ID=sa;Password=123456";
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string strCon = "server=.\\SQLEXPRESS;database=sample;uid=sa;pwd=123456";
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<add name ="accessConnectionString" connectionString ="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\yx.mdb" providerName ="System.Data.OleDb"/>
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string strCon = System.Configuration.ConfigurationManager.ConnectionStrings["accessConnectionString"].ToSt
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