Custom Section / NameValueSectionHandler in Webconfig

Amir Krish

I have custom section Links which I Should edit from UI. While saving I couldn't save the value of the corresponding key. It shows "collection is read only" error. Please help me to resolve this. Thanks in Advance.

WebConfig

<sectionGroup name="Menu">
<section name="Links" type="System.Configuration.NameValueSectionHandler"/>
sectionGroup>

NameValueCollection nameValueCol = (NameValueCollection)ConfigurationManager.GetSection("Menu/Links");
var Key = "Key";
var Value = "Value";
nameValueCol.Set(Key, Value); // Error: collection is read only

so I tried to remove and add the keys still it shows same error.

nameValueCol.Remove(Key); // Error: collection is read only
nameValueCol.Add(Key, Value);

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Rajeev Punhani10y ago
Accepted answer
Hi Amir,
Please find the below link.
http://yizeng.me/2013/08/31/update-appsettings-and-custom-configuration-sections-in-appconfig-at-runtime/
http://stackoverflow.com/questions/16700015/c-sharp-error-collection-is-read-only
http://netcode.ru/dotnet/?artID=7235
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Rajeev Punhani10y ago
Hi Amir,
you can edit those values but those won't be reflected in web.config if you open it until application is restarted.If application is restarted you sessions will be lost.
If the above solution is helpful then,accept the answer.

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Amir Krish10y ago
Thanks Rajeev Punhani, Its helps me lot. I can edit the values, but the section is not refreshing, its shows old value once it edit, after refreshing the UI page it showing the current value
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