How to change the app.config file at runtime?

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how can I change the app.config file at runtime?

I want to change the connection string:

<add name="WiconEstoqueDataContextConnectionString" connectionString="User Id=USER;Password=PASS;Host=HOST;Database=wicon_estoque;Persist Security Info=True" />
c#

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Hello, try this on:

var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
connectionStringsSection.ConnectionStrings["WiconEstoqueDataContextConnectionString"].ConnectionString = "sua nova conexão";
config.Save();
ConfigurationManager.RefreshSection("connectionStrings");

I hope this can help you.

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