求解答这段代码，为什么我设置好SQL服务器参数之后还是用不了。

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appSettings>
<add key="Url" value="localhost" />
<add key="License" value="" />
<add key="DbType" value="0" />
<add key="SqlConnection" value="Provider=SQLOLEDB;Data Source=;Initial Catalog=;User ID=;Password=" />
<add key="ManageDirectory" value="/e/master/" />
<add key="AutoTask" value="0" />
</appSettings>
<system.web>
<httpModules>
</httpModules>
<pages validateRequest="false" enableEventValidation="false" enableViewStateMac="false" viewStateEncryptionMode="Never" />
<compilation defaultLanguage="C#" debug="false" />
<authentication mode="Forms" />
<customErrors mode="Off">
<error statusCode="404" redirect="/error404.html" />
</customErrors>
<globalization requestEncoding="utf-8" responseEncoding="utf-8" fileEncoding="utf-8" />
<httpRuntime maxRequestLength="1024000" executionTimeout="3600" />
<trust level="Full" originUrl="" />
</system.web>
</configuration>