Web.config

 <connectionStrings>
      <add name="ConnectionString" connectionString="Data Source=.;Initial Catalog=asp-test;User ID=;Password=;Integrated Security=True" providerName="System.Data.SqlClient"/>
 </connectionStrings>

查詢測試

string 
 sqlconnstr=ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlConnection sqlconn = new SqlConnection(sqlconnstr);
        SqlCommand sqlcommand = new SqlCommand();
        sqlcommand.Connection = sqlconn;
        sqlconn.Open();
        sqlcommand.CommandText = "select * from uesr";
        SqlDataReader sqldatareader = sqlcommand.ExecuteReader();
        while (sqldatareader.Read())
        {
            Label1.Text += sqldatareader.GetInt32(0)+"<span style='color:Red'>||||||</span>";
            Label1.Text += sqldatareader.GetString(1) + "<span style='color:Red'>||||||</span>";
            Label1.Text += sqldatareader.GetInt32(2) + "<span style='color:Red'>||||||</span>";
            Label1.Text += sqldatareader.GetInt32(3);
        };
        sqlcommand = null;
        sqlconn.Close();
        sqlconn = null;