Here Mudassar Ahmed Khan has explained with an example, how to send email using GMAIL SMTP Server using C# and VB.Net.

Here Mudassar Ahmed Khan has explained how to resolve the error Failure sending email in ASP.Net.

Generally the Failure sending email error comes when debugged leads to the following error:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required in ASP.Net Application.
Thus this article will cover the common solutions which can resolve the issue.

Here Mudassar Ahmed Khan has explained with an example, how to validate Email using JavaScript and Regular Expression (Regex) in ASP.Net MVC Razor.

When the Submit Button is clicked, the Email Address in the TextBox will be validated using JavaScript and Regular Expression (Regex) and if the Email Address is invalid, the error message will be displayed next to the TextBox in ASP.Net MVC Razor.

Here Mudassar Ahmed Khan has explained with an example, how to export Crystal Report to PDF and send as Email Attachment in ASP.Net using C# and VB.Net.

Crystal Report provides function named ExportToStream which exports Crystal Report to Word, Excel, PDF or CSV file in Stream format.

Later the Stream can be used to attach the exported PDF file as Attachment and send as Email.