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Code Signing certificates are used to verify the author of software packages and are necessary to avoid security warnings when users install software off the internet. Code signing certificates are purchased from Certificate Authorities and/or resellers which are companies which perform personal or corporate verification. Upon successful verification, the certifying company will provide you with a certificate, which is then used to sign all software work product that will be made available to the public. This post addresses the process by which one installs a Sectigo, formerly Comodo, code signing certificate.    Read More. 

SynopsisThis example creates an Excel file in a memory stream, dynamically, using OpenXML and AspNetCore. Then, it returns it to the user in the form of an Excel file with the proper mime type such that the user will be prompted to open the file with Excel. The Excel file sample shows how to create text cells, date ells, number cells, boolean cells, and cells with formulas. This example also demonstrates how to construct a stylesheet as well as formatting columns.    Read More. 

This post provides a class that converts an RFC 822 formatted text representation of a date time to a DateTime object in C#. Really Simple Syndication (RSS) documents, according to the RSS specification, require that all date-times in RSS conform to the Date and Time Specification as outlined in RFC 822. Therefore, when working with RSS documents in AspNetCore and C#, it is necessary to convert the date-time in the RSS Document to a datetime object in C#. With understanding that the DateTime.Parse and DateTime.ParseExact methods of the C# datetime object have been tested and do not handle the parsing of all forms of an RFC 822 compliant date, it was deemed necessary to develop a more robust solution.    Read More. 

This post provides a generic class that allows easy implementation and usage of Session Variables in an AspNetCore web application. Session Variables in AspNetCore web applications are somewhat cryptic when compared to other programming languages like PHP. This class attempts to alleviate the complexities by providing a very simple object that manages a website user's session meanwhile allowing the programmer to concentrate on the data model representing what he or she wants to store on the server side.    Read More. 

Often times, one must give users the ability to both select from a predefined list and free form type into a text box as an answer to a question on an HTML form. In standard HTML, there is the input text box which accepts any input. In addition, there is the Select box that allows one to pick from a predefined list of options. However, if you want both functionality, you must construct it yourself. This solution uses Twitter Bootstrap 4, HTML, and Javascript.    Read More. 

This post shows how to open a MySql database connection using PHP.    Read More. 

This post shows how to use the HttpClient in C#. The HttpClient is the means by which asp.net core, and windows application perform web service calls. This sample uses a wrapper class around the HttpClient object such that appropriate error handling can be accomplished.    Read More. 

This post shows how to send an email message with an embedded image as part of the message.    Read More. 

This post shows how to use a sortedset in c#    Read More. 
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Paul F. Sirpenski
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