Retrive data from session variables

S

Santosh

Dear All

i am writting a code sending mail with attachement.

i am writting code for sending mail in one page and code for attaching
a file in the next page.
aftet attaching a file i am taking name of that file from attaching
file page to email page through in session file .i am giving a
facility of attaching five files to user . and i am taking names of
both files in session variables but user attach less than five five
then values of another session becomes null null and when i am coming
on send email page it throws an error object is not set to referance of
an object. can any one tell me how i can manage the value of session if
it is null.

any help will be greatly apreciated.


Here is my code.

Code with SendEmail Page

if(!Page.IsPostBack)
{
try
{
if(Request.QueryString.Count >0 )//&&
Session["file1_Length"].ToString()==null)
{
mailTo_TextBox.Text=Session["toMailId"].ToString();
mailCC_TextBox.Text=Session["mailCC"].ToString();
mailBCC_TextBox.Text=Session["mailBCC"].ToString();
mailSubject_TextBox.Text=Session["mailSubject"].ToString();
mailBody_TextBox.Text=Session["mailBody"].ToString();

attachedFileName_Label.Visible=true;
fileSize_Label.Visible=true;
fileSize_Label.Text =
Request.QueryString["file1_Name"].ToString();//Session["file1_Length"].ToString()+"K";
removeAttachedFile_LinkButton.Visible=true;
attachedFileName_Label.Text=Request.QueryString["file1_Name"].ToString();
//Session["file1_Name"].ToString();

attachedFileName1_Label.Visible=true;
fileSize2_Label.Visible=true;
fileSize2_Label.Text = Session["file2_Length"].ToString()+"K";
removeAttachedFile1_LinkButton.Visible=true;
attachedFileName1_Label.Text=Session["file2_Name"].ToString();

attachedFileName2_Label.Visible=true;
fileSize3_Label.Visible=true;
fileSize3_Label.Text = Session["file3_Length"].ToString()+"K";
removeAttachedFile2_LinkButton.Visible=true;
attachedFileName2_Label.Text=Session["file3_Name"].ToString();

attachedFileName3_Label.Visible=true;
fileSize4_Label.Visible=true;
fileSize4_Label.Text = Session["file4_Length"].ToString()+"K";
removeAttachedFile3_LinkButton.Visible=true;
attachedFileName3_Label.Text=Session["file4_Name"].ToString();

attachedFileName4_Label.Visible=true;
fileSize_Label.Visible=true;
fileSize_Label.Text = Session["file5_Length"].ToString()+"K";
removeAttachedFile4_LinkButton.Visible=true;
attachedFileName4_Label.Text=Session["file5_Name"].ToString();

}
}
catch( Exception ex)
{
Response.Write("<script language=javascript>
alert('"+ex.Message.ToString() +"');</script>");
}
}
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.sendMail1_Button.Click += new
System.EventHandler(this.sendMail1_Button_Click);
this.addCC_LinkButton.Click += new
System.EventHandler(this.addCC_LinkButton_Click);
this.addBCC_LinkButton.Click += new
System.EventHandler(this.addBCC_LinkButton_Click);
this.removeAttachedFile_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile_LinkButton_Click);
this.removeAttachedFile1_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile1_LinkButton_Click);
this.removeAttachedFile2_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile2_LinkButton_Click);
this.removeAttachedFile3_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile3_LinkButton_Click);
this.removeAttachedFile4_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile4_LinkButton_Click);
this.attachFiles_Button.Click += new
System.EventHandler(this.attachFiles_Button_Click);
this.bold_ImageButton.Click += new
System.Web.UI.ImageClickEventHandler(this.bold_ImageButton_Click);
this.italic_ImageButton.Click += new
System.Web.UI.ImageClickEventHandler(this.italic_ImageButton_Click);
this.underline_ImageButton.Click += new
System.Web.UI.ImageClickEventHandler(this.underline_ImageButton_Click);
this.sendMail_Button.Click += new
System.EventHandler(this.sendMail_Button_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void LinkButton1_Click(object sender, System.EventArgs e)
{
Response.Redirect("ResourceDefination.aspx",false);
}

MailAttachment attach_1,attach_2,attach_3,attach_4,attach_5 ;
private void sendMail1_Button_Click(object sender, System.EventArgs
e)
{
try
{
MailMessage newMessage = new MailMessage();

newMessage.To = mailTo_TextBox.Text.Trim();
newMessage.From ="(e-mail address removed)";
newMessage.Bcc = mailBCC_TextBox.Text.Trim();
newMessage.Cc = mailCC_TextBox.Text.Trim();
newMessage.Body = mailBody_TextBox.Text;
newMessage.Subject = mailSubject_TextBox.Text;
newMessage.BodyFormat = MailFormat.Html;

if(Session["file1_Name"].ToString()!=""
||Session["file1_Name"].ToString()!= null )
{
attach_1 = new
MailAttachment(Server.MapPath(Session["file1_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_1);
}
if(Session["file2_Name"].ToString()!=""
||Session["file2_Name"].ToString()!= null )
{
attach_2 = new
MailAttachment(Server.MapPath(Session["file2_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_2);
}
if(Session["file3_Name"].ToString()!=""
||Session["file3_Name"].ToString()!= null )
{
attach_3 = new
MailAttachment(Server.MapPath(Session["file3_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_3);
}
if(Session["file4_Name"].ToString()!=""
||Session["file4_Name"].ToString()!= null )
{
attach_4 = new
MailAttachment(Server.MapPath(Session["file4_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_4);
}
if(Session["file5_Name"].ToString()!=""
||Session["file5_Name"].ToString()!= null )
{
attach_5 = new
MailAttachment(Server.MapPath(Session["file5_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_5);
}

SmtpMail.Send(newMessage);
}
catch(Exception ex)
{
Response.Write("<script language=javascript>alert('"+
ex.Message.ToString() +"');</script>");

}
}



Code for attaching a file to mail



private void attachFiles_Button_Click(object sender, System.EventArgs
e)
{
string
strFile1_Name,strFile2_Name,strFile3_Name,strFile4_Name,strFile5_Name;
int
attachFile1_Length,attachFile2_Length,attachFile3_Length,attachFile4_Length,attachFile5_Length;
string unit;
/* Beginning of Attachment1 process &
Check the first open file dialog for a attachment */
if (attachFile1.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile1 = attachFile1.PostedFile;
/* Get size of the file */
attachFile1_Length = attFile1.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile1_Length > 0)
{
/* Get the file name */
strFile1_Name = Path.GetFileName(attachFile1.PostedFile.FileName);
attachFile1.PostedFile.SaveAs(Server.MapPath(strFile1_Name));
attachedFileName_Label.Text = strFile1_Name.ToString();
fileSize1_Label.Text = Convert.ToInt32(attachFile1_Length)+ " KB "
+ attFile1.ContentType.ToString();
Request.QueryString["file1_Name"]=strFile1_Name;
//Session["file1_Name"]=strFile1_Name;
Request.QueryString["file1_Length"]=Convert.ToInt32(attachFile1_Length).ToString();
SetControls();
}
}

if (attachFile2.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile2 = attachFile2.PostedFile;
/* Get size of the file */
attachFile2_Length = attFile2.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile2_Length > 0)
{
/* Get the file name */
strFile2_Name = Path.GetFileName(attachFile2.PostedFile.FileName);
attachFile2.PostedFile.SaveAs(Server.MapPath(strFile2_Name));
attachedFileName1_Label.Text = strFile2_Name.ToString();
fileSize2_Label.Text = Convert.ToInt32(attachFile2_Length) + " KB
" + attFile2.ContentType.ToString();
Session["file2_Name"]=strFile2_Name;
Session["file2_Length"]=Convert.ToInt32(attachFile2_Length);
SetControls();
}
}
if (attachFile3.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile3 = attachFile3.PostedFile;
/* Get size of the file */
attachFile3_Length = attFile3.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile3_Length > 0)
{
/* Get the file name */
strFile3_Name = Path.GetFileName(attachFile3.PostedFile.FileName);
attachFile3.PostedFile.SaveAs(Server.MapPath(strFile3_Name));
attachedFileName2_Label.Text = strFile3_Name.ToString();
fileSize3_Label.Text = Convert.ToInt32(attachFile3_Length) + " KB
" + attFile3.ContentType.ToString();
Session["file3_Name"]=strFile3_Name;
Session["file3_Length"]=Convert.ToInt32(attachFile3_Length);
SetControls();
}
}
if (attachFile4.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile4 = attachFile4.PostedFile;
/* Get size of the file */
attachFile4_Length = attFile4.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile4_Length > 0)
{
/* Get the file name */
strFile4_Name = Path.GetFileName(attachFile4.PostedFile.FileName);
attachFile4.PostedFile.SaveAs(Server.MapPath(strFile4_Name));
attachedFileName3_Label.Text = strFile4_Name.ToString();
fileSize4_Label.Text = Convert.ToInt32(attachFile4_Length) + " KB
" + attFile4.ContentType.ToString();
Session["file4_Name"]=strFile4_Name;
Session["file4_Length"]=Convert.ToInt32(attachFile4_Length);
SetControls();
}
}
if (attachFile5.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile5 = attachFile5.PostedFile;
/* Get size of the file */
attachFile5_Length = attFile5.ContentLength;
unit = attFile5.ContentType.ToString();
/* Make sure the size of the file is > 0 */
if (attachFile5_Length > 0)
{
/* Get the file name */
strFile5_Name = Path.GetFileName(attachFile5.PostedFile.FileName);
attachFile5.PostedFile.SaveAs(Server.MapPath(strFile5_Name));
attachedFileName4_Label.Text = strFile5_Name.ToString();
fileSize5_Label.Text = Convert.ToInt32(attachFile5_Length)+ " KB "
+ attFile5.ContentType.ToString();
Session["file5_Name"]=strFile5_Name;
Session["file5_Length"]=Convert.ToInt32(attachFile5_Length);
SetControls();
}
}
else
{
return;
}
}



private void continueToMessage_Button_Click(object sender,
System.EventArgs e)
{
string msgOne = "attachFiles";
//string send = "?A" + "?B" + "?C" +"?D" + "?E" + msgOne + " + "+
Session["file1_Name"].ToString()+" ";

string send = "?A" + "+ msgOne +";
Response.Redirect("EMail.aspx" + send);
}
 
H

Hans Kesting

The test
Session["file1_Length"].ToString()==null
is wrong. A "ToString()" will always return a string (possibly an empty
one), never a null. More important, if Session["file1_length"] does not
exist (is null), then this will give a NullReferenceException.

You need to test
Session["file1_length"] == null

This test will also solve your other problems: if some file is not
defined, don't try to do something with it.

Hans Kesting
Dear All

i am writting a code sending mail with attachement.

i am writting code for sending mail in one page and code for attaching
a file in the next page.
aftet attaching a file i am taking name of that file from attaching
file page to email page through in session file .i am giving a
facility of attaching five files to user . and i am taking names of
both files in session variables but user attach less than five five
then values of another session becomes null null and when i am coming
on send email page it throws an error object is not set to referance of
an object. can any one tell me how i can manage the value of session if
it is null.

any help will be greatly apreciated.

Here is my code.

Code with SendEmail Page

if(!Page.IsPostBack)
{
try
{
if(Request.QueryString.Count >0 )//&&
Session["file1_Length"].ToString()==null)
{
mailTo_TextBox.Text=Session["toMailId"].ToString();
mailCC_TextBox.Text=Session["mailCC"].ToString();
mailBCC_TextBox.Text=Session["mailBCC"].ToString();
mailSubject_TextBox.Text=Session["mailSubject"].ToString();
mailBody_TextBox.Text=Session["mailBody"].ToString();

attachedFileName_Label.Visible=true;
fileSize_Label.Visible=true;
fileSize_Label.Text =
Request.QueryString["file1_Name"].ToString();//Session["file1_Length"].ToString()+"K";
removeAttachedFile_LinkButton.Visible=true;
attachedFileName_Label.Text=Request.QueryString["file1_Name"].ToString();
//Session["file1_Name"].ToString();

attachedFileName1_Label.Visible=true;
fileSize2_Label.Visible=true;
fileSize2_Label.Text = Session["file2_Length"].ToString()+"K";
removeAttachedFile1_LinkButton.Visible=true;
attachedFileName1_Label.Text=Session["file2_Name"].ToString();

attachedFileName2_Label.Visible=true;
fileSize3_Label.Visible=true;
fileSize3_Label.Text = Session["file3_Length"].ToString()+"K";
removeAttachedFile2_LinkButton.Visible=true;
attachedFileName2_Label.Text=Session["file3_Name"].ToString();

attachedFileName3_Label.Visible=true;
fileSize4_Label.Visible=true;
fileSize4_Label.Text = Session["file4_Length"].ToString()+"K";
removeAttachedFile3_LinkButton.Visible=true;
attachedFileName3_Label.Text=Session["file4_Name"].ToString();

attachedFileName4_Label.Visible=true;
fileSize_Label.Visible=true;
fileSize_Label.Text = Session["file5_Length"].ToString()+"K";
removeAttachedFile4_LinkButton.Visible=true;
attachedFileName4_Label.Text=Session["file5_Name"].ToString();

}
}
catch( Exception ex)
{
Response.Write("<script language=javascript>
alert('"+ex.Message.ToString() +"');</script>");
}
}
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.sendMail1_Button.Click += new
System.EventHandler(this.sendMail1_Button_Click);
this.addCC_LinkButton.Click += new
System.EventHandler(this.addCC_LinkButton_Click);
this.addBCC_LinkButton.Click += new
System.EventHandler(this.addBCC_LinkButton_Click);
this.removeAttachedFile_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile_LinkButton_Click);
this.removeAttachedFile1_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile1_LinkButton_Click);
this.removeAttachedFile2_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile2_LinkButton_Click);
this.removeAttachedFile3_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile3_LinkButton_Click);
this.removeAttachedFile4_LinkButton.Click += new
System.EventHandler(this.removeAttachedFile4_LinkButton_Click);
this.attachFiles_Button.Click += new
System.EventHandler(this.attachFiles_Button_Click);
this.bold_ImageButton.Click += new
System.Web.UI.ImageClickEventHandler(this.bold_ImageButton_Click);
this.italic_ImageButton.Click += new
System.Web.UI.ImageClickEventHandler(this.italic_ImageButton_Click);
this.underline_ImageButton.Click += new
System.Web.UI.ImageClickEventHandler(this.underline_ImageButton_Click);
this.sendMail_Button.Click += new
System.EventHandler(this.sendMail_Button_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void LinkButton1_Click(object sender, System.EventArgs e)
{
Response.Redirect("ResourceDefination.aspx",false);
}

MailAttachment attach_1,attach_2,attach_3,attach_4,attach_5 ;
private void sendMail1_Button_Click(object sender, System.EventArgs
e)
{
try
{
MailMessage newMessage = new MailMessage();

newMessage.To = mailTo_TextBox.Text.Trim();
newMessage.From ="(e-mail address removed)";
newMessage.Bcc = mailBCC_TextBox.Text.Trim();
newMessage.Cc = mailCC_TextBox.Text.Trim();
newMessage.Body = mailBody_TextBox.Text;
newMessage.Subject = mailSubject_TextBox.Text;
newMessage.BodyFormat = MailFormat.Html;

if(Session["file1_Name"].ToString()!=""
Session["file1_Name"].ToString()!= null )
{
attach_1 = new
MailAttachment(Server.MapPath(Session["file1_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_1);
}
if(Session["file2_Name"].ToString()!=""
Session["file2_Name"].ToString()!= null )
{
attach_2 = new
MailAttachment(Server.MapPath(Session["file2_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_2);
}
if(Session["file3_Name"].ToString()!=""
Session["file3_Name"].ToString()!= null )
{
attach_3 = new
MailAttachment(Server.MapPath(Session["file3_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_3);
}
if(Session["file4_Name"].ToString()!=""
Session["file4_Name"].ToString()!= null )
{
attach_4 = new
MailAttachment(Server.MapPath(Session["file4_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_4);
}
if(Session["file5_Name"].ToString()!=""
Session["file5_Name"].ToString()!= null )
{
attach_5 = new
MailAttachment(Server.MapPath(Session["file5_Name"].ToString()));
/* Attach the newly created email attachment */
newMessage.Attachments.Add(attach_5);
}

SmtpMail.Send(newMessage);
}
catch(Exception ex)
{
Response.Write("<script language=javascript>alert('"+
ex.Message.ToString() +"');</script>");

}
}

Code for attaching a file to mail

private void attachFiles_Button_Click(object sender, System.EventArgs
e)
{
string
strFile1_Name,strFile2_Name,strFile3_Name,strFile4_Name,strFile5_Name;
int
attachFile1_Length,attachFile2_Length,attachFile3_Length,attachFile4_Length,attachFile5_Length;
string unit;
/* Beginning of Attachment1 process &
Check the first open file dialog for a attachment */
if (attachFile1.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile1 = attachFile1.PostedFile;
/* Get size of the file */
attachFile1_Length = attFile1.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile1_Length > 0)
{
/* Get the file name */
strFile1_Name = Path.GetFileName(attachFile1.PostedFile.FileName);
attachFile1.PostedFile.SaveAs(Server.MapPath(strFile1_Name));
attachedFileName_Label.Text = strFile1_Name.ToString();
fileSize1_Label.Text = Convert.ToInt32(attachFile1_Length)+ " KB "
+ attFile1.ContentType.ToString();
Request.QueryString["file1_Name"]=strFile1_Name;
//Session["file1_Name"]=strFile1_Name;
Request.QueryString["file1_Length"]=Convert.ToInt32(attachFile1_Length).ToString();
SetControls();
}
}

if (attachFile2.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile2 = attachFile2.PostedFile;
/* Get size of the file */
attachFile2_Length = attFile2.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile2_Length > 0)
{
/* Get the file name */
strFile2_Name = Path.GetFileName(attachFile2.PostedFile.FileName);
attachFile2.PostedFile.SaveAs(Server.MapPath(strFile2_Name));
attachedFileName1_Label.Text = strFile2_Name.ToString();
fileSize2_Label.Text = Convert.ToInt32(attachFile2_Length) + " KB
" + attFile2.ContentType.ToString();
Session["file2_Name"]=strFile2_Name;
Session["file2_Length"]=Convert.ToInt32(attachFile2_Length);
SetControls();
}
}
if (attachFile3.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile3 = attachFile3.PostedFile;
/* Get size of the file */
attachFile3_Length = attFile3.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile3_Length > 0)
{
/* Get the file name */
strFile3_Name = Path.GetFileName(attachFile3.PostedFile.FileName);
attachFile3.PostedFile.SaveAs(Server.MapPath(strFile3_Name));
attachedFileName2_Label.Text = strFile3_Name.ToString();
fileSize3_Label.Text = Convert.ToInt32(attachFile3_Length) + " KB
" + attFile3.ContentType.ToString();
Session["file3_Name"]=strFile3_Name;
Session["file3_Length"]=Convert.ToInt32(attachFile3_Length);
SetControls();
}
}
if (attachFile4.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile4 = attachFile4.PostedFile;
/* Get size of the file */
attachFile4_Length = attFile4.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFile4_Length > 0)
{
/* Get the file name */
strFile4_Name = Path.GetFileName(attachFile4.PostedFile.FileName);
attachFile4.PostedFile.SaveAs(Server.MapPath(strFile4_Name));
attachedFileName3_Label.Text = strFile4_Name.ToString();
fileSize4_Label.Text = Convert.ToInt32(attachFile4_Length) + " KB
" + attFile4.ContentType.ToString();
Session["file4_Name"]=strFile4_Name;
Session["file4_Length"]=Convert.ToInt32(attachFile4_Length);
SetControls();
}
}
if (attachFile5.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile5 = attachFile5.PostedFile;
/* Get size of the file */
attachFile5_Length = attFile5.ContentLength;
unit = attFile5.ContentType.ToString();
/* Make sure the size of the file is > 0 */
if (attachFile5_Length > 0)
{
/* Get the file name */
strFile5_Name = Path.GetFileName(attachFile5.PostedFile.FileName);
attachFile5.PostedFile.SaveAs(Server.MapPath(strFile5_Name));
attachedFileName4_Label.Text = strFile5_Name.ToString();
fileSize5_Label.Text = Convert.ToInt32(attachFile5_Length)+ " KB "
+ attFile5.ContentType.ToString();
Session["file5_Name"]=strFile5_Name;
Session["file5_Length"]=Convert.ToInt32(attachFile5_Length);
SetControls();
}
}
else
{
return;
}
}

private void continueToMessage_Button_Click(object sender,
System.EventArgs e)
{
string msgOne = "attachFiles";
//string send = "?A" + "?B" + "?C" +"?D" + "?E" + msgOne + " + "+
Session["file1_Name"].ToString()+" ";

string send = "?A" + "+ msgOne +";
Response.Redirect("EMail.aspx" + send);
}
 

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