{"id":6279,"date":"2024-03-14T04:04:10","date_gmt":"2024-03-14T04:04:10","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-modify-the-app-config-configuration-file-in-c\/"},"modified":"2025-08-02T01:32:43","modified_gmt":"2025-08-02T01:32:43","slug":"how-to-modify-the-app-config-configuration-file-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-modify-the-app-config-configuration-file-in-c\/","title":{"rendered":"Modify app.config in C#: Complete Guide"},"content":{"rendered":"<p>In C#, the app.config configuration file can be modified using the following steps:<\/p>\n<ol>\n<li>Open the app.config file in the Visual Studio project.<\/li>\n<li>Locate the configuration items that need to be modified in the file, such as:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">appSettings<\/span>&gt;<\/span>\r\n  <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">add<\/span> <span class=\"hljs-attr\">key<\/span>=<span class=\"hljs-string\">\"SomeSetting\"<\/span> <span class=\"hljs-attr\">value<\/span>=<span class=\"hljs-string\">\"SomeValue\"<\/span> \/&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">appSettings<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Change the value of the configuration item, for example, modify SomeValue to NewValue:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">appSettings<\/span>&gt;<\/span>\r\n  <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">add<\/span> <span class=\"hljs-attr\">key<\/span>=<span class=\"hljs-string\">\"SomeSetting\"<\/span> <span class=\"hljs-attr\">value<\/span>=<span class=\"hljs-string\">\"NewValue\"<\/span> \/&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">appSettings<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Save the files and rebuild the project.<\/li>\n<li>Use the ConfigurationManager class in the code to read and modify configuration values, for example:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-built_in\">string<\/span> settingValue = ConfigurationManager.AppSettings[<span class=\"hljs-string\">\"SomeSetting\"<\/span>];\r\nConsole.WriteLine(settingValue);\r\n<\/code><\/pre>\n<p>By following the above steps, you can modify the configuration parameter values in the app.config file in C#.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C#, the app.config configuration file can be modified using the following steps: Open the app.config file in the Visual Studio project. Locate the configuration items that need to be modified in the file, such as: &lt;appSettings&gt; &lt;add key=&#8221;SomeSetting&#8221; value=&#8221;SomeValue&#8221; \/&gt; &lt;\/appSettings&gt; Change the value of the configuration item, for example, modify SomeValue to NewValue: [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[7426,7428,274,708,791],"class_list":["post-6279","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-app-config","tag-application-settings","tag-c","tag-configuration","tag-visual-studio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Modify app.config in C#: Complete Guide - 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