{"id":20695,"date":"2024-03-15T20:49:51","date_gmt":"2024-03-15T20:49:51","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/"},"modified":"2024-03-21T18:42:28","modified_gmt":"2024-03-21T18:42:28","slug":"how-to-prevent-sql-injection-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/","title":{"rendered":"How to prevent SQL injection in C#?"},"content":{"rendered":"<p>In C#, parameterized queries can be used to prevent SQL injection. Parameterized queries involve separating query parameters from the SQL statement, ensuring that input values are properly encoded before being passed to the database.<\/p>\n<p>Here is an example of using parametrized query:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">using<\/span> (SqlConnection connection = <span class=\"hljs-keyword\">new<\/span> SqlConnection(connectionString))\r\n{\r\n    connection.Open();\r\n    \r\n    <span class=\"hljs-built_in\">string<\/span> query = <span class=\"hljs-string\">\"SELECT * FROM Users WHERE Username = @Username AND Password = @Password\"<\/span>;\r\n    SqlCommand command = <span class=\"hljs-keyword\">new<\/span> SqlCommand(query, connection);\r\n    \r\n    <span class=\"hljs-comment\">\/\/ \u6dfb\u52a0\u53c2\u6570\u5e76\u8bbe\u7f6e\u503c<\/span>\r\n    command.Parameters.AddWithValue(<span class=\"hljs-string\">\"@Username\"<\/span>, username);\r\n    command.Parameters.AddWithValue(<span class=\"hljs-string\">\"@Password\"<\/span>, password);\r\n    \r\n    SqlDataReader reader = command.ExecuteReader();\r\n    \r\n    <span class=\"hljs-comment\">\/\/ \u5904\u7406\u67e5\u8be2\u7ed3\u679c<\/span>\r\n    <span class=\"hljs-keyword\">while<\/span> (reader.Read())\r\n    {\r\n        <span class=\"hljs-comment\">\/\/ \u5904\u7406\u6bcf\u4e00\u884c\u6570\u636e<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the above example, the Parameters.AddWithValue method of the SqlCommand class is used to add parameters. This ensures that the values of the parameters are properly encoded, preventing SQL injection attacks.<\/p>\n<p>It is recommended to always use parameterized queries to execute database operations, as they not only prevent SQL injection but also improve query performance and allow for the reuse of compiled query plans when executing the same query multiple times.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C#, parameterized queries can be used to prevent SQL injection. Parameterized queries involve separating query parameters from the SQL statement, ensuring that input values are properly encoded before being passed to the database. Here is an example of using parametrized query: using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); string query = &#8220;SELECT * [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-20695","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>How to prevent SQL injection in C#? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to prevent SQL injection in C#?\" \/>\n<meta property=\"og:description\" content=\"In C#, parameterized queries can be used to prevent SQL injection. Parameterized queries involve separating query parameters from the SQL statement, ensuring that input values are properly encoded before being passed to the database. Here is an example of using parametrized query: using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); string query = &quot;SELECT * [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T20:49:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T18:42:28+00:00\" \/>\n<meta name=\"author\" content=\"Sophia Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sophia Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/\"},\"author\":{\"name\":\"Sophia Anderson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/19a24313de9c988db3d69226b4a40a30\"},\"headline\":\"How to prevent SQL injection in C#?\",\"datePublished\":\"2024-03-15T20:49:51+00:00\",\"dateModified\":\"2024-03-21T18:42:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/\"},\"wordCount\":121,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-prevent-sql-injection-in-c\/\",\"name\":\"How to prevent SQL injection in C#? 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