如何在web.config中建立公用的的数据库连接

<configuration>
<!-- application specific settings -->
<appSettings>
<add key=ConnectionString value=server=localhost;uid=sa;pwd=;database=store />
</appSettings>
<configuration>

public SqlDataReader GetReviews(int productID) {

// 创建Connection和Command对象实例
SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings[ConnectionString]);
SqlCommand myCommand = new SqlCommand(ReviewsList, myConnection);

myCommand.CommandType = CommandType.StoredProcedure;

// 参数
SqlParameter parameterProductID = new SqlParameter(@ProductID, SqlDbType.Int, 4);
parameterProductID.Value = productID;
myCommand.Parameters.Add(parameterProductID);

// 执行
myConnection.Open();
SqlDataReader result = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

// 返回结果
return result;
数据库连接;return true>