How Can I Programmatically Modify Web.config Settings Using C#?

Dynamically Managing Web.config Settings Using C#

Dynamically altering web.config settings is frequently necessary for adapting application behavior. C# offers robust tools for this, leveraging configuration objects.

Accessing the Web.config File:

The WebConfigurationManager.OpenWebConfiguration method loads the web.config file into a manageable configuration object:

<code class="language-csharp">var config = WebConfigurationManager.OpenWebConfiguration("~");</code>

Updating Connection Strings:

Modifying connection strings involves accessing the connectionStrings section and updating the relevant entry:

<code class="language-csharp">var section = (ConnectionStringsSection)config.GetSection("connectionStrings");
section.ConnectionStrings["MyConnectionString"].ConnectionString = "Data Source=..."; </code>

Persisting Changes:

After making modifications, save the changes back to the web.config file:

<code class="language-csharp">config.Save();</code>

Important Note on Permissions:

In certain environments, you might need to implement impersonation to grant the application sufficient privileges to write to the web.config file. Consult the linked resource for detailed guidance on impersonation techniques.

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