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C# ASP.Net system.net.mail: How to Pass in Variable and Send Mail??

Posted on 2008-10-18
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Last Modified: 2013-12-17
Hello,
I am trying to use System.Net.Mail to send an email notification from a web page and have run into a couple road blocks.  Any help would be appreciated!

What I am trying to do:
I am creating a web project that allows users to upload and download files.  I want an email notification to be sent to the administrator when a file has been downloaded and an email notification to be sent to the user when a file has been uploaded for them.

I am completely stuck.  I am very new to development and in addition to simply making System.Net.Mail work, I am finding that I am having trouble figuring out how to pass the variables from my aspx page to my class page.  In particular, you can see that I am having trouble grabbing the user name from the aspx page...to get it there I would use:

string UserName = User.Identity.Name;

But I don't know how to move it.

Finally, once I do have everything passed correctly, I am really not sure how to call this from the code behind.  I have read a lot of examples (including: http://forums.asp.net/t/971802.aspx?PageIndex=1) but I have to use the format below and I am lost.

I included all the code that I thought relevant.

Thanks for the help!
AJ
MailMessage.cs:
 
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;
using System.Text;
 
namespace FileTransfer2
{
    public class SendMailMessage
    {
        private int _fileID;
        private string _UserName; //do the same thing with username
 
        public SendMailMessage(int fileID, string _UserName)
        {
            _fileID = fileID;
            _UserName = UserName; //this has to be passed in from the code behind
        }
 
        public void DownloadSendMessage(int fileid, string ToAddress, string action)
        {
            
           
            ClientFileRepository repository = new ClientFileRepository();
            DataTable FilebyID = repository.GetFileInfo(fileid);
 
            string FileName;
            string FilePath;
            string UserName =  ; //incomplete
             
            if (FilebyID != null && FilebyID.Rows.Count > 0)
             {
                FileName = FilebyID.Rows[0]["FileName"].ToString();
                FilePath = FilebyID.Rows[0]["ClientFile"].ToString();
             }
            
         
            string from = ConfigurationManager.AppSettings["AdminEmailAddress"];
            string subject = string.Format("File {0} was {3}ed by {1} at {2:MM/dd/yy}",
               FilePath, userName, DateTime.Today, action);
            
            StringBuilder body = new StringBuilder();
            body.AppendLine("A file was downloaded");
            body.AppendLine();
            body.AppendLine();
            body.AppendFormat("UserName: {0}\n", userName);
            body.AppendFormat("FileName: {0}\n", FileName);
 
 
            MailMessage DownloadMessage = new MailMessage(from, ToAddress, subject, body.ToString());
            SmtpClient mSmtpClient = new SmtpClient();
            mSmtpClient.Send(DownloadMessage);
        }   
 
    }
}
 
 
ClientFileRepository.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data;
using System.Data.SqlClient;
 
namespace FileTransfer2
{
    public class ClientFileRepository
    {
 
        public int InsertNewFile(string fileName, string description, string clientfile)
        {
            int result = 0;  
            try
            {
                using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["FileTransferConnectionString"].ToString()))
                {
                    using (SqlCommand cmd = new SqlCommand("InsertNewFile", conn)) 
                    {
 
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@FileName", fileName);
                        cmd.Parameters.AddWithValue("@Description", description);
                        cmd.Parameters.AddWithValue("@ClientFile", clientfile);
                        conn.Open();
                        result = int.Parse(cmd.ExecuteScalar().ToString()); 
                    }
                }
            }
            catch (SqlException ex)
            {
                throw ex;
            }
 
            return result;
        }
 
 
        public DataTable GetFileInfo(int id)
        {
            try
            {
 
                using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["FileTransferConnectionString"].ToString()))
                {
                    using (SqlCommand cmd = new SqlCommand("getFilebyFileID", conn)) 
                    {
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@Id", id);
 
                        SqlDataAdapter daFilesbyId = new SqlDataAdapter(cmd);
                        DataTable FilesbyId = new DataTable();
                        conn.Open();
                        daFilesbyId.Fill(FilesbyId);
                        return FilesbyId;
                    }
                }
            }
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
 
        }
 
        public DataTable GetUserGuid(string UserName)
        {
            try
            {
 
                using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["FileTransferConnectionString"].ToString()))
                {
                    using (SqlCommand cmd = new SqlCommand("getUserID", conn))
                    {
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@UserName", UserName);
 
                        SqlDataAdapter daGetUserGuid = new SqlDataAdapter(cmd);
                        DataTable UserGuid = new DataTable();
                        conn.Open();
                        daGetUserGuid.Fill(UserGuid);
                        return UserGuid;
                    }
                }
            }
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
        }
 
        public void InsertUser_ClientFile(Guid guid, int fileid)
        {
            try
            {
 
                using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["FileTransferConnectionString"].ToString()))
                {
                    using (SqlCommand cmd = new SqlCommand("InsertUser_ClientFile", conn)) 
                    {
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@userguid", guid);
                        cmd.Parameters.AddWithValue("@fileid", fileid);
                        conn.Open();
                        cmd.ExecuteNonQuery();
                    }
                }
            }
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
        }
 
        public void UpdateESign(int id, string eSignUserName)
        {
            try
            {
 
                using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["FileTransferConnectionString"].ToString()))
                {
                    using (SqlCommand cmd = new SqlCommand("updateESign", conn)) 
                    {
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@id", id);
                        cmd.Parameters.AddWithValue("@eSignUserName", eSignUserName);
                        conn.Open();
                        cmd.ExecuteNonQuery();
                    }
                }
            }
 
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
        }
    }
}
 
 
ViewClientFilebyDateRange.aspx:
 
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using FileTransfer2.DataSets;
using System.Net.Mail;
 
namespace FileTransfer2
{
    public partial class ViewClientFilesbyDateRange : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ObjectDataSource1.SelectParameters["UserName"].DefaultValue = this.User.Identity.Name;
            ObjectDataSource1.SelectParameters["startDate"].ConvertEmptyStringToNull = true;
            ObjectDataSource1.SelectParameters["endDate"].ConvertEmptyStringToNull = true;
 
            if (!Page.IsPostBack)
            {
                ObjectDataSource1.SelectParameters["startDate"].DefaultValue = string.Empty;
                ObjectDataSource1.SelectParameters["endDate"].DefaultValue = string.Empty;
                GridView1.DataBind(); 
            }
 
        }
 
        protected void btnSubmitDates_Click(object sender, EventArgs e)
        {
            ObjectDataSource1.SelectParameters["startDate"].DefaultValue = this.txtStartDate.Text.Trim();
            ObjectDataSource1.SelectParameters["endDate"].DefaultValue = this.txtEndDate.Text.Trim();
            GridView1.DataBind();
        }
 
        protected void GridView1_RowDatabound(object sender, GridViewRowEventArgs e)
        {
 
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                
                HyperLink download = ((HyperLink)e.Row.FindControl("HyperLink1"));
                DataRowView row = (DataRowView)e.Row.DataItem;
                download.NavigateUrl = String.Format("DownloadFile.aspx?ID={0}", row["ID"]);
 
                HyperLink sign = ((HyperLink)e.Row.FindControl("HyperLink2"));
                sign.NavigateUrl = String.Format("eSign.aspx?ID={0}", row["ID"]);
 
            }
        }
 
 
        protected void btnUploadFile_Click(object sender, EventArgs e)
        {
            Response.Redirect("FileUpload.aspx");
         
        }
 
        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
          
            int rowIndex = Convert.ToInt32(e.CommandArgument); //CommandArgument passed in row ID (not file ID)
            
            int clientFileID = (int)GridView1.DataKeys[rowIndex].Values[0]; 
            
            switch (e.CommandName)
            {
                case "Download": //named the CommandName "Download" in the grid props
                    DownloadFile(clientFileID);
                    break;
                default:
                    break;
            } 
        }
 
        private void DownloadFile(int clientFileID)
        {
            SendDownloadNotificaitonEmail(clientFileID); //stuck here, I need to send a UserName too, is this the right place??
 
            HelperFunctions.TransmitFile(clientFileID);
           
        }
 
        private void SendDownloadNotificaitonEmail(int clientFileID) //stuck here, do I need both?
        {
 
        }
 
 
   }
 
    
}
 
 
HelperFunctions.cs:
 
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
 
namespace FileTransfer2
{
    public static class HelperFunctions
    {
        public static void TransmitFile(int id)
        {
            try
            {
 
                 HttpResponse Response = HttpContext.Current.Response; //makes Response available
                
                ClientFileRepository repository = new ClientFileRepository();
                DataTable FilebyID = repository.GetFileInfo(id);
                if (FilebyID != null && FilebyID.Rows.Count > 0)
                {
                    string FileName = FilebyID.Rows[0]["FileName"].ToString();
                    string FilePath = FilebyID.Rows[0]["ClientFile"].ToString();
                    string FileExtension = System.IO.Path.GetExtension(FilePath);
                    Response.Clear();
                    Response.ClearContent();
                    Response.ClearHeaders();
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + FileName);
                    Response.ContentType = (FileExtension);
                    Response.TransmitFile(FilePath);
                    HttpContext.Current.ApplicationInstance.CompleteRequest();
 
                }
            }
 
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
 
        }
    }
}
 
Web.config: (just the app settings part)
 
<configuration>
 
	<appSettings>
		<add key="UploadDirectory" value="c:\Uploads\" />
		<add key ="AdminEmailAddress" value="validaddress@validdomain.com" />
	   </appSettings>

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Question by:AJ0424
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3 Comments
 
LVL 1

Expert Comment

by:hakkekushou
ID: 22752851
Pass the username from the page instead of initializing its value in your class.
0
 

Author Comment

by:AJ0424
ID: 22752993
Thank you but that was the first part of what I was asking how to do.  I think I may have figured out how to pass it from the aspx page but I am not sure yet because I am still trying to determine how to call the method from the aspx page.  My changes are below.

Thanks,
AJ

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;
using System.Text;
 
namespace TestProject
{
    public class SendMailMessage
    {
        private int _fileID;
        private string _UserName; 
 
        public SendMailMessage(int fileID, string _UserName)
        {
            _fileID = fileID;
            _UserName = HttpContext.Current.Session["UserName"].ToString(); //this is how I am trying to pass the current username from the aspx page
        }
 
 
        public void DownloadSendMessage(int fileid, string ToAddress, string action)
        {
 
 
            ClientFileRepository repository = new ClientFileRepository();
            DataTable FilebyID = repository.GetFileInfo(fileid);
 
            string FileName = null;
            string FilePath = null;
            string UserName = _UserName; //incomplete
 
            if (FilebyID != null && FilebyID.Rows.Count > 0)
            {
                FileName = FilebyID.Rows[0]["FileName"].ToString();
                FilePath = FilebyID.Rows[0]["ClientFile"].ToString();
            }
 
            string from = ConfigurationManager.AppSettings["AdminEmailAddress"];
            string subject = string.Format("File {0} was downloaded by {1} at {2:MM/dd/yy}",
                FilePath, UserName, DateTime.Today);
 
            //string subject = string.Format("File {0} was {3}ed by {1} at {2:MM/dd/yy}",
            //   FilePath, UserName, DateTime.Today, action); //action will = upload or download, need to pass it in somehow
 
            StringBuilder body = new StringBuilder();
            body.AppendLine("A file was downloaded");
            body.AppendLine();
            body.AppendLine();
            body.AppendFormat("UserName: {0}\n", UserName);
            body.AppendFormat("FileName: {0}\n", FileName);
 
 
            MailMessage DownloadMessage = new MailMessage(from, ToAddress, subject, body.ToString());
            SmtpClient mSmtpClient = new SmtpClient();
            mSmtpClient.Send(DownloadMessage);
        }   
 
 
    }
}
 
 
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using FileTransfer2.DataSets;
using System.Net.Mail;
 
namespace TestProject
{
    public partial class ViewClientFilesbyDateRange : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ObjectDataSource1.SelectParameters["UserName"].DefaultValue = this.User.Identity.Name;
            ObjectDataSource1.SelectParameters["startDate"].ConvertEmptyStringToNull = true;
            ObjectDataSource1.SelectParameters["endDate"].ConvertEmptyStringToNull = true;
 
            if (!Page.IsPostBack)
            {
                ObjectDataSource1.SelectParameters["startDate"].DefaultValue = string.Empty;
                ObjectDataSource1.SelectParameters["endDate"].DefaultValue = string.Empty;
                GridView1.DataBind(); 
            }
 
            Session["UserName"] = User.Identity.Name;
            //Response.Write(Session["UserName"]); //verifying UserName
 
 
        }
 
        protected void btnSubmitDates_Click(object sender, EventArgs e)
        {
            ObjectDataSource1.SelectParameters["startDate"].DefaultValue = this.txtStartDate.Text.Trim();
            ObjectDataSource1.SelectParameters["endDate"].DefaultValue = this.txtEndDate.Text.Trim();
            GridView1.DataBind();
        }
 
        protected void GridView1_RowDatabound(object sender, GridViewRowEventArgs e)
        {
 
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                
                HyperLink download = ((HyperLink)e.Row.FindControl("HyperLink1"));
                DataRowView row = (DataRowView)e.Row.DataItem;
                download.NavigateUrl = String.Format("DownloadFile.aspx?ID={0}", row["ID"]);
 
                HyperLink sign = ((HyperLink)e.Row.FindControl("HyperLink2"));
                sign.NavigateUrl = String.Format("eSign.aspx?ID={0}", row["ID"]);
 
            }
        }
 
 
        protected void btnUploadFile_Click(object sender, EventArgs e)
        {
            Response.Redirect("FileUpload.aspx");
         
        }
 
        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
          
 
            int rowIndex = Convert.ToInt32(e.CommandArgument); 
            
            int clientFileID = (int)GridView1.DataKeys[rowIndex].Values[0]; 
                        
            switch (e.CommandName)
            {
                case "Download": 
                    DownloadFile(clientFileID);
                    break;
                default:
                    break;
            } 
        }
 
        private void DownloadFile(int clientFileID)
        {
            SendDownloadNotificaitonEmail(clientFileID); 
 
            HelperFunctions.TransmitFile(clientFileID);
           
        }
 
        private void SendDownloadNotificaitonEmail(int clientFileID) 
        {
            //stuck here
        }
        
 
   }
 
    
}
 
 
 
    public static class HelperFunctions
    {
        public static void TransmitFile(int id)
        {
            try
            {
 
                HttpResponse Response = HttpContext.Current.Response; 
                
                ClientFileRepository repository = new ClientFileRepository();
                DataTable FilebyID = repository.GetFileInfo(id);
                if (FilebyID != null && FilebyID.Rows.Count > 0)
                {
                    string FileName = FilebyID.Rows[0]["FileName"].ToString();
                    string FilePath = FilebyID.Rows[0]["ClientFile"].ToString();
                    string FileExtension = System.IO.Path.GetExtension(FilePath);
                    Response.Clear();
                    Response.ClearContent();
                    Response.ClearHeaders();
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + FileName);
                    Response.ContentType = (FileExtension);
                    Response.TransmitFile(FilePath);
                    HttpContext.Current.ApplicationInstance.CompleteRequest();
 
                }
            }
 
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
 
        }
    }
 
 
 
public class ClientFileRepository
    {
 
        public DataTable GetFileInfo(int id)
        {
            try
            {
 
                using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["FileTransferConnectionString"].ToString()))
                {
                    using (SqlCommand cmd = new SqlCommand("getFilebyFileID", conn)) //stored proc name
                    {
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@Id", id);
 
                        SqlDataAdapter daFilesbyId = new SqlDataAdapter(cmd);
                        DataTable FilesbyId = new DataTable();
                        conn.Open();
                        daFilesbyId.Fill(FilesbyId);
                        return FilesbyId;
                    }
                }
            }
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
 
        }
 
 
<configuration>
 
	<appSettings>
		<add key ="AdminEmailAddress" value="validEmailAddress@validDomain.com" />
	   </appSettings>

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Accepted Solution

by:
prairiedog earned 500 total points
ID: 22757616

private void SendDownloadNotificaitonEmail(int clientFileID) 
{
      // assign ToAddress, then
      SendMailMessage smm = new SendMailMessage();
      smm.DownloadSendMessage(clientFileID, ToAddress, "download");
      
}

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