https://www.c-sharpcorner.com/articles/Articles from C# Corner© 1999 - 2026 CSharp Inc. All contents are copyright of their authors.In this article I will describe how to check previous instance (single instance) of an C# windows application and also whether a MDI child is set to a MDI parenthttps://www.c-sharpcorner.com/UploadFile/rehan2004/checking-previous-instance-single-instance-of-an-C-Sharp-windows-application-also-setting-mdi-child-fo/https://www.c-sharpcorner.com/UploadFile/rehan2004/checking-previous-instance-single-instance-of-an-C-Sharp-windows-application-also-setting-mdi-child-fo/Thu, 04 Sep 2008 00:00:00 GMTnoreply@c-sharpcorner.com (Rehan Ahmad Abbasi)This article will guide you on how to post data to an HTTPS (i.e., secure connection) URL from a Windows application (.NET) by attaching a digital certificate from a certificate file and getting the response back.https://www.c-sharpcorner.com/UploadFile/rehan2004/attaching-a-digital-certificate-public-key-to-an-https-request/https://www.c-sharpcorner.com/UploadFile/rehan2004/attaching-a-digital-certificate-public-key-to-an-https-request/Sun, 10 Aug 2008 00:00:00 GMTnoreply@c-sharpcorner.com (Rehan Ahmad Abbasi)This article shows how to pass SQL query parameters to Crystal Reports using Oracle.https://www.c-sharpcorner.com/UploadFile/rehan2004/how-to-pass-sql-query-parameters-to-crystal-reports-using-oracle/https://www.c-sharpcorner.com/UploadFile/rehan2004/how-to-pass-sql-query-parameters-to-crystal-reports-using-oracle/Wed, 06 Aug 2008 00:00:00 GMTnoreply@c-sharpcorner.com (Rehan Ahmad Abbasi)