through exception in mvc on send email - asp.net-mvc

Question

I want to send email from an excel file.
When It get wrong email address it stop sending.
I want it send all email and at last show me wrong email that isn't able to send.
This my code for read Excel file:
if (!string.IsNullOrWhiteSpace(excel))
{
var src = excel;
DataSet ds = new DataSet();
string fileExtension = System.IO.Path.GetExtension(Server.MapPath("~/") + src);
if (fileExtension == ".xls" || fileExtension == ".xlsx")
{
string fileLocation = Server.MapPath("~/") + src;
string excelConnectionString = string.Empty;
excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
fileLocation + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
if (fileExtension == ".xls")
{
excelConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
fileLocation + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
}
else if (fileExtension == ".xlsx")
{
excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
fileLocation + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
}
OleDbConnection excelConnection = new OleDbConnection(excelConnectionString);
excelConnection.Open();
DataTable dt = new DataTable();
dt = excelConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
if (dt == null)
{
return null;
}
String[] excelSheets = new String[dt.Rows.Count];
int t = 0;
foreach (DataRow row in dt.Rows)
{
excelSheets[t] = row["TABLE_NAME"].ToString();
t++;
}
OleDbConnection excelConnection1 = new OleDbConnection(excelConnectionString);
string query = string.Format("Select * from [{0}]", excelSheets[0]);
using (OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, excelConnection1))
{
dataAdapter.Fill(ds);
}
}
if (fileExtension.ToString().ToLower().Equals(".xml"))
{
string fileLocation = Server.MapPath("~/") + src;
if (System.IO.File.Exists(fileLocation))
{
System.IO.File.Delete(fileLocation);
}
Request.Files["FileUpload"].SaveAs(fileLocation);
XmlTextReader xmlreader = new XmlTextReader(fileLocation);
// DataSet ds = new DataSet();
ds.ReadXml(xmlreader);
xmlreader.Close();
}
And this is code for send email:
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
string excelname = "";
if (lang == "1")
{
excelname = "<div style='text-align:right;'>" + ds.Tables[0].Rows[i][0].ToString() + "<br/>" + ds.Tables[0].Rows[i][1].ToString() + "</div>";
}
else
{
excelname = "<div style='text-align:left;'>" + ds.Tables[0].Rows[i][0].ToString() + "<br/>" + ds.Tables[0].Rows[i][1].ToString() + "</div>";
}
exceltotal = excelname + text + newslink + attach;
//sender
message = string.Format(body, img, exceltotal, title, prehead, senderemail);
MailMessage email = new MailMessage();
email.To.Add(ds.Tables[0].Rows[i][2].ToString());
email.From = new MailAddress(senderemail);
email.Subject = maintitle;
email.Body = message + makedelivey(ds.Tables[0].Rows[i][2].ToString(), maintitle);
email.BodyEncoding = System.Text.Encoding.UTF8;
email.IsBodyHtml = true;
SmtpClient ssmtp = new SmtpClient();
ssmtp.Host = server;
ssmtp.Port = port;
ssmtp.UseDefaultCredentials = false;
ssmtp.Credentials = new System.Net.NetworkCredential(senderemail, senderpassword);
ssmtp.EnableSsl = false;
ssmtp.Send(email);
exceltotal = "";
message = "";
}
It read a text file and add some value from excel or database base on user selection.

Answer 1

I couldn't find line of code which sends email. But wherever you are sending the email inside the loop, make sure you enclose that code in try catch block. This ensures even if a mail send operation is failed, the error is handled and goes on with other mails. You can include your consolidate and formatting of failures issues in catch block.
var consolidateErrors = string.Empty;
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
Try
{
//Mail sending logic here
}
Catch(Exception ex)
{
consolidateErrors += YourErrorDetails;
}
}