Sending Emails Using SendGrid and Asynchronous Functions in WinForm Applications

Category > WINFORMS || Published on : Tuesday, April 18, 2023 || Views: 1055 || SendGrid WinForm applications Asynchronous functions Email sending C# NuGet packages


In this article, we'll explore how to send emails using SendGrid in a WinForm application with the help of asynchronous functions. SendGrid is a cloud-based email service that allows you to send emails in a reliable and scalable way. By using asynchronous functions, you can improve the responsiveness of your WinForm application and prevent it from freezing while sending emails. We'll cover the steps required to set up SendGrid, add the SendGrid package to your project, and implement the asynchronous email sending function. We'll also show an example implementation of a WinForm application that sends emails using SendGrid asynchronously.

Yes, it is possible to create a WinForm application that sends emails using SendGrid and utilizes asynchronous functions. Here's an example implementation:

First, you will need to add the SendGrid package to your project. You can do this by opening the NuGet Package Manager Console and running the following command:

Install-Package Sendgrid

Next, you will need to add the following namespaces to your code file:

using SendGrid;
using SendGrid.Helpers.Mail;
using System.Threading.Tasks;

Then, you can create a function to send the email asynchronously. Here's an example implementation:

private async Task SendEmailAsync(string recipientEmail, string subject, string message)
{
    var apiKey = "YOUR_SENDGRID_API_KEY";
    var client = new SendGridClient(apiKey);
    var from = new EmailAddress("YOUR_SENDER_EMAIL", "YOUR_SENDER_NAME");
    var to = new EmailAddress(recipientEmail);
    var plainTextContent = message;
    var htmlContent = "<p>" + message + "</p>";
    var msg = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
    var response = await client.SendEmailAsync(msg);
    // Check if the email was sent successfully
    if (response.StatusCode == System.Net.HttpStatusCode.Accepted)
    {
        MessageBox.Show("Email sent successfully.");
    }
    else
    {
        MessageBox.Show("Error sending email: " + response.StatusCode);
    }
}

In this function, you first create a SendGrid client with your API key. Then, you create an email message with the recipient email address, subject, and message. Finally, you call the SendEmailAsync function on the client and await the response. If the email was sent successfully, you display a message box indicating success. Otherwise, you display a message box indicating an error occurred.

You can then call this function when the user clicks a button or performs some other action in your WinForm application. For example:

private async void btnSendEmail_Click(object sender, EventArgs e)
{
    var recipientEmail = txtRecipientEmail.Text;
    var subject = txtSubject.Text;
    var message = txtMessage.Text;
    await SendEmailAsync(recipientEmail, subject, message);
}

In this example, the SendEmailAsync function is called when the user clicks a button with the ID btnSendEmail. The recipient email, subject, and message are obtained from text boxes with the IDs txtRecipientEmail, txtSubject, and txtMessage, respectively.

Note that in this example, the SendEmailAsync function is marked as async. This allows it to be called asynchronously and awaited, which improves the responsiveness of your WinForm application.