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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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Comment
Question by:AJ0424
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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LVL 22

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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