回答編集履歴
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動作するソースを追記
answer
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`ConfigurationManager`ではなく、`WebConfigurationManager`を使うのかな？
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以下のページにサンプルがありますので、見てみてください :D
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参考: [How to: Read Connection Strings from the Web.config File](https://msdn.microsoft.com/en-us/library/ms178411.aspx)
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参考: [How to: Read Connection Strings from the Web.config File](https://msdn.microsoft.com/en-us/library/ms178411.aspx)
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-- 追記
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Web.config (`connectionString`は変更してください)
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<configuration>
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<connectionStrings>
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<add name="DefaultConnection" connectionString="..." />
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</connectionStrings>
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</configuration>
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```
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```csharp
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using System.Web.Configuration;
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string ConectionStr = WebConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
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```
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