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Unable to read app.config in WPF application

I am getting the following error while trying to read an app.config file from my wpf application

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appsettings>
    <add key="Environment" value="DEV"/>
  </appsettings>
<startup>
  <supportedRuntime useLegacyV2RuntimeActivationPolicy="true" version="v4.0" sku=".NETFramework,Version=v4.0"  />
</startup>
</configuration>

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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appsettings>
<add key="Environment" value="DEV"/>
</appsettings>
<startup>
<supportedRuntime useLegacyV2RuntimeActivationPolicy="true" version="v4.0" sku=".NETFramework,Version=v4.0" />
</startup>
</configuration>
The invocation of the constructor on type XYZ that
matches the specified binding constraints threw an exception.' Line number '7' and line position '48'.

Miguel Oz

useLegacyV2RuntimeActivationPolicy is an startup attribute, thus, your startup element must be modified as follows:

<startup useLegacyV2RuntimeActivationPolicy="true">
  <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"  />
</startup>

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countrymeister

ASKER

still getting the same error , here is the updated config file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appsettings>
<add key="Environment" value="DEV"/>
</appsettings>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
</startup>
</configuration>

countrymeister

ASKER

Ok, I figured out this issue appsettingsis not correct it should be appSettings. XML is case sensitive

countrymeister

ASKER

I've requested that this question be closed as follows:

Accepted answer: 0 points for countrymeister's comment #a39460511

for the following reason:

I found the solution myself

Miguel Oz

Actually, you have two errors and I solved the one you asked in this question. My points please.

ASKER CERTIFIED SOLUTION

countrymeister

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countrymeister

ASKER

I gave mas_oz2003 ample time to reply why he should be granted the points.
I also gave an example of my solution without his suggested code which works