c# - How to get the key value from the AppSettings.Config file? -

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i'm trying key value set in appsettings.config file seems not working.

this wrote that. code called constructor of mdi file , returning null value. know why?

     var getvalue = configurationsettings.appsettings["showquerytextbox"];

i tried configurationmanager.appsettings . didnt work.

my appsettings code follows.

<configuration>   <appsettings>     <add key="showquerytextbox" value="true"/>   </appsettings> </configuration>

configurationsettings.appsettings obsolete, try

configurationmanager.appsettings["showquerytextbox"];

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