How to fetch and read emails from a specific email address in asp.net webforms?

Question

i want to know how i can fetch and read Emails in Webforms from a specific Email Address, i have searched internet and found few solutions but now appropriate what i want? i'm using OPENPOP to fetch emails. i'm sharing my code please tell me how i can do this.

Page Class:

public partial class CS : System.Web.UI.Page
{
    protected List<Email> Emails
    {
        get { return (List<Email>)ViewState["Emails"]; }
        set { ViewState["Emails"] = value; }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.Read_Emails();
        }
    }

    private void Read_Emails()
    {
        Pop3Client pop3Client;
        if (Session["Pop3Client"] == null)
        {
            pop3Client = new Pop3Client();
            pop3Client.Connect("pop.gmail.com", 995, true);
            pop3Client.Authenticate("email@gmail.com", "123456", AuthenticationMethod.TryBoth);
            Session["Pop3Client"] = pop3Client;
        }
        else
        {
            pop3Client = (Pop3Client)Session["Pop3Client"];
        }
        int count = pop3Client.GetMessageCount();
        this.Emails = new List<Email>();
        int counter = 0;
        for (int i = count; i >= 1; i--)
        {
            Message message = pop3Client.GetMessage(i);
            Email email = new Email()
            {
                MessageNumber = i,
                Subject = message.Headers.Subject,
                DateSent = message.Headers.DateSent,
                From = string.Format("<a href = 'mailto:{1}'>{0}</a>", message.Headers.From.DisplayName, message.Headers.From.Address),
            };
            MessagePart body = message.FindFirstHtmlVersion();
            if (body != null)
            {
                email.Body = body.GetBodyAsText();
            }
            else
            {
                body = message.FindFirstPlainTextVersion();
                if (body != null)
                {
                    email.Body = body.GetBodyAsText();
                }
            }
            List<MessagePart> attachments = message.FindAllAttachments();

            foreach (MessagePart attachment in attachments)
            {
                email.Attachments.Add(new Attachment
                {
                    FileName = attachment.FileName,
                    ContentType = attachment.ContentType.MediaType,
                    Content = attachment.Body
                });
            }
            this.Emails.Add(email);
            counter++;
            if (counter > 2)
            {
                break;
            }
        }
        gvEmails.DataSource = this.Emails;
        gvEmails.DataBind();
    }
    protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Repeater rptAttachments = (e.Row.FindControl("rptAttachments") as Repeater);
            List<Attachment> attachments = this.Emails.Where(email => email.MessageNumber == Convert.ToInt32(gvEmails.DataKeys[e.Row.RowIndex].Value)).FirstOrDefault().Attachments;
            rptAttachments.DataSource = attachments;
            rptAttachments.DataBind();
        }
    }
    protected void Download(object sender, EventArgs e)
    {
        LinkButton lnkAttachment = (sender as LinkButton);
        GridViewRow row = (lnkAttachment.Parent.Parent.NamingContainer as GridViewRow);
        List<Attachment> attachments = this.Emails.Where(email => email.MessageNumber == Convert.ToInt32(gvEmails.DataKeys[row.RowIndex].Value)).FirstOrDefault().Attachments;
        Attachment attachment = attachments.Where(a => a.FileName == lnkAttachment.Text).FirstOrDefault();
        Response.AddHeader("content-disposition", "attachment;filename=" + attachment.FileName);
        Response.ContentType = attachment.ContentType;
        Response.BinaryWrite(attachment.Content);
        Response.End();
    }
}

Email ANd Attachment Class:

[Serializable]
public class Email
{
    public Email()
    {
        this.Attachments = new List<Attachment>();
    }
    public int MessageNumber { get; set; }
    public string From { get; set; }
    public string Subject { get; set; }
    public string Body { get; set; }
    public DateTime DateSent { get; set; }
    public List<Attachment> Attachments { get; set; }
}
[Serializable]
public class Attachment
{
    public string FileName { get; set; }
    public string ContentType { get; set; }
    public byte[] Content { get; set; }
}

how i can fetch email from a specific sender like "abc@def.com".

Answer 1

You can't get messages from just a specific user directly. But if you don't want to download everything to find out if you need anything, use GetMessageHeaders() to get the message headers and look at the .From property to see if it matches what you want... and if it does, THEN download the e-mail's contents.