Single Mailbox bulk email program Email WinForm

Using System;
Using System.Collections.Generic;
Using System.ComponentModel;
Using System.Data;
Using System.Drawing;
Using System.Linq;
Using System.Text;
Using System.Threading.Tasks;
Using System.Windows.Forms;
Using System.Net.Mail;
Using System.Net.Mime;
Using System.Net;
Using System.IO;
Using System.Data.OleDb;

Namespace Sendemail1._0
{
public partial class Mail:form
{
Public Mail ()
{

InitializeComponent ();
}
list<string> listemail = new list<string> ();
<summary>
Form loading
</summary>
<param name= "Sender" ></param>
<param name= "E" ></param>
private void Mail_load (object sender, EventArgs e)
{
Add the names of the two smpt servers
CMBBOXSMTP.ITEMS.ADD ("smtp.163.com");
CMBBOXSMTP.ITEMS.ADD ("SMTP. Qq.com ");
CMBBOXSMTP.ITEMS.ADD ("smtp.gmail.com");
Set as drop-down list
Cmbboxsmtp.dropdownstyle = ComboBoxStyle.DropDownList;
The first option is selected by default
Cmbboxsmtp.selectedindex = 1;
Add what you want to initialize below, such as display name, user name, etc.
}

private void Btn_send_click (object sender, EventArgs e)
{
Try
{
MessageBox.Show (SendEmail (Txtemail.text));
}
catch (Exception ex)
{

MessageBox.Show (ex. Message);
}
}

private string SendEmail (String toemail)
{
Try
{
Determine the SMTP server address. Instantiate an SMTP client
System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient (cmbboxsmtp.text);
Generate a Send address
String strfrom = String. Empty;
if (Cmbboxsmtp.selectedindex = = 0)
{
Strfrom = txtUsername.Text + "@163.com";
}
else if (Cmbboxsmtp.selectedindex = = 1)
{
Strfrom = txtUsername.Text + "@QQ. com";
}
Else
{
Strfrom = txtUsername.Text + "@gmail. com";
}

Constructs a sender Address object
MailAddress from = new MailAddress (strfrom, Txtdisplayname.text, Encoding.UTF8);
Constructs a recipient Address object
MailAddress to = new MailAddress (Txtemail.text, Txttoname.text, Encoding.UTF8);

//Construct an email message object
MailMessage message = new MailMessage ();
message. To.add (Toemail);
//message. To.add ("[email protected]");
message. from = from;
//Add attachment to Message
foreach (TreeNode TreeNode in treeviewfilelist.nodes)
{
//Get file name
string filename = tr Eenode.text;
//Determine if the file exists
if (file.exists (fileName))
{
//constructs an Attachment object
Attachment attach = new Attachment (filename);
Get the information for the file
contentdisposition disposition = attach. Contentdisposition;
Disposition. CreationDate = System.IO.File.GetCreationTime (fileName);
Disposition. Modificationdate = System.IO.File.GetLastWriteTime (fileName);
Disposition. Readdate = System.IO.File.GetLastAccessTime (fileName);
//Add an attachment to a message
message. Attachments.Add (attach);
}
Else
{
MessageBox.Show ("file + FileName +" not found!) ");
}
}

Add message subject and content
Message. Subject = Txtsubject.text;
Message. subjectencoding = Encoding.UTF8;
Message. Body = Rtxtbody.text;
Message. bodyencoding = Encoding.UTF8;

Set information for a message
Client. Deliverymethod = Smtpdeliverymethod.network;
Message. bodyencoding = System.Text.Encoding.UTF8;
Message. Isbodyhtml = false;

If the server supports a secure connection, set the secure connection to true.
Gmail support, 163 not supported, if it is Gmail, be sure to set it to true
if (Cmbboxsmtp.selectedtext = = "Smpt.163.com")
Client. Enablessl = false;
Else
Client. Enablessl = true;

Set the user name and password.
String userState = message. Subject;
Client. useDefaultCredentials = false;
string username = txtUsername.Text;
string passwd = txtPassword.Text;
User login Information
NetworkCredential mycredentials = new NetworkCredential (username, passwd);
Client. Credentials = mycredentials;
Send mail
Client. Send (message);
Prompt to send successfully
Return "Success:" + Toemail;
MessageBox.Show ("sent successfully!");
}
catch (Exception ex)
{
Return "failed:" + toemail + "; Reason:" + ex. Message;
MessageBox.Show (ex. Message);
}
}

private void btnAdd_Click (object sender, EventArgs e)
{//define and initialize an object of the OpenFileDialog class
OpenFileDialog openFile = new OpenFileDialog ();
Openfile.initialdirectory = Application.startuppath;
Openfile.filename = "";
Openfile.restoredirectory = true;
Openfile.multiselect = false;

Displays the Open File dialog box and determines whether the OK button is clicked
if (openfile.showdialog () = = DialogResult.OK)
{
Get the selected file name
string fileName = Openfile.filename;
Add a file name to the TreeView
TREEVIEWFILELIST.NODES.ADD (FileName);
}

}

private void Btndelete_click (object sender, EventArgs e)
{
Determine if the node is selected
if (Treeviewfilelist.selectednode! = null)
{
Get the selected node
TreeNode Tempnode = Treeviewfilelist.selectednode;
Delete the selected node
TreeViewFileList.Nodes.Remove (Tempnode);
}
Else
{
MessageBox.Show ("Select the attachment you want to delete. ");
}
}

<summary>
Mass
</summary>
<param name= "Sender" ></param>
<param name= "E" ></param>
private void Btnsends_click (object sender, EventArgs e)
{
list<string> list = new list<string> ();

int sendnum = 0;
string s = txttoemails.text;
string[] Sarray = S.split (new char[] {' \ r ', ' \ n '});
for (int i = 0; i < sarray.length; i++)
{
Sarray[i] is the contents of each line
if (!string. IsNullOrEmpty (Sarray[i]))
{
List. ADD (Sarray[i]);
}

}
foreach (var item in list)
{
String str = SendEmail (item);
if (str. Split (': ') [0]. Equals ("Success"))
{
Sendnum + = 1;
Txtlog. Text + = str + System.Environment.NewLine;
}
Else
{
Txtlog. Text + = str + System.Environment.NewLine;
}

}
MessageBox.Show ("Send successfully" + sendnum + "message");

}
<summary>
Uploading Contacts
</summary>
<param name= "Sender" ></param>
<param name= "E" ></param>
private void Btnuptoemail_click (object sender, EventArgs e)
{
OpenFileDialog openFile = new OpenFileDialog ();
Openfile.initialdirectory = Application.startuppath;
Openfile.filename = "";
Openfile.restoredirectory = true;
Openfile.multiselect = false;

Displays the Open File dialog box and determines whether the OK button is clicked
if (openfile.showdialog () = = DialogResult.OK)
{
Get the selected file name
string fileName = Openfile.filename;
Add a file name to the TreeView
Txttoemails.text=filename;

DataSet ds = Exceltods (fileName);
foreach (DataRow cRow in DS. Tables[0]. Rows)
{
Txttoemails.text + = crow["Email"]. ToString () + System.Environment.NewLine;

}

}
}
<summary>
Read Excel
</summary>
<param name= "Path" ></param>
<returns></returns>
Public DataSet exceltods (string Path)
{
This connection can only manipulate Excel2007 (. xls) files
String strconn = "provider=microsoft.jet.oledb.4.0;" + "Data source=" + Path + ";" + "Extended properties=excel 8.0;";
This connection can manipulate the. xls and. xlsx files (connection strings that support Excel2003 and Excel2007)
Remark: "Hdr=yes;" Is that the first line of the Excel file is the column name instead of the data, "HDR=NO;" It's just the opposite of the front.
"Imex=1" If the data type in the column is inconsistent, the use of "imex=1" will avoid data type collisions.
String strconn = "provider=microsoft.ace.oledb.12.0;" + "Data source=" + Path + "; Extended properties= ' Excel 12.0; Hdr=yes; Imex=1 ' ";
OleDbConnection conn = new OleDbConnection (strconn);
Conn. Open ();
String strexcel = "";
OleDbDataAdapter mycommand = null;
DataSet ds = null;
Strexcel = "SELECT * FROM [sheet1$]";
mycommand = new OleDbDataAdapter (Strexcel, strconn);
ds = new DataSet (); Mycommand.fill (ds, "Table1");
return DS;
}
}
}

Single Mailbox bulk email program Email WinForm