I got the ERROR while run my page

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Hi Friends While i m going to run my page i am getting the

Error : Unable to cast object of type 'System.String' to type 'System.Byte[]'. like this, will you please give me a help please

code here

Dim TableContainer As New DataTable
Try
Dim getvalues As New Select_Property()
Dim ReturnVar As Integer = 1
BusinessLayer = New BLL()

values.FLAG = "EMAIL"
getsetvalues.order_No = MessageID

TableContainer = BusinessLayer.GenerateData(values, func_amc(sess_id), strUserCode, strEqyPage, "")

If TableContainer.Rows.Count > 0 Then
Dim attachment As String = "attachment; filename= _received.eml"
Response.ContentType = "application/windows live mail 2012"
Response.AddHeader("Content-Disposition", attachment)
Response.ClearContent()
Response.Charset = ""

If (Not TableContainer.Rows(0).Item(0) Is DBNull.Value) Then
MailBLOB = CType(TableContainer.Rows(0).Item(0), Byte())
End If
Response.OutputStream.Read(MailBLOB, 0, MailBLOB.Length)
TableContainer = Nothing
Else
ClientScript.RegisterStartupScript(Me.GetType(), "Message", "<script> alert('No E-mail Attached');</script>")
End If
'End If
Catch ex1 As Threading.ThreadAbortException
Catch e As Exception
Finally
BusinessLayer.Dispose()
End Try

Regrds ,
Velsamy A

Posted 16-Apr-14 18:14pm

avelsamy

Updated 20-Apr-14 18:36pm

v2

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Comments

Tom Marvolo Riddle 17-Apr-14 0:19am

post your code

Sanket Saxena 17-Apr-14 0:46am

cant help without seeing your code.

avelsamy 17-Apr-14 6:42am

Dim TableContainer As New DataTable
Try
Dim getvalues As New Select_Property()
Dim ReturnVar As Integer = 1
BusinessLayer = New BLL()

values.FLAG = "EMAIL"
getsetvalues.order_No = MessageID

TableContainer = BusinessLayer.GenerateData(values, func_amc(sess_id), strUserCode, strEqyPage, "")

If TableContainer.Rows.Count > 0 Then
Dim attachment As String = "attachment; filename= _received.eml"
Response.ContentType = "application/windows live mail 2012"
Response.AddHeader("Content-Disposition", attachment)
Response.ClearContent()
Response.Charset = ""

If (Not TableContainer.Rows(0).Item(0) Is DBNull.Value) Then
MailBLOB = CType(TableContainer.Rows(0).Item(0), Byte())
End If
Response.OutputStream.Read(MailBLOB, 0, MailBLOB.Length)
TableContainer = Nothing
Else
ClientScript.RegisterStartupScript(Me.GetType(), "Message", "<script> alert('No E-mail Attached');</script>")
End If
'End If
Catch ex1 As Threading.ThreadAbortException
Catch e As Exception
Finally
BusinessLayer.Dispose()
End Try

Sergey Alexandrovich Kryukov 17-Apr-14 13:04pm

You can put this code in your question, using "Improve question". Please don't put code in comments, as they are not so readable.
—SA

Sergey Alexandrovich Kryukov 17-Apr-14 1:47am

Okay, the line of code showing this error is extremely silly. That's all what anyone can say based on your information.
Case closed.

With such questioning skills you hardly can hope for any real help.

—SA

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Gopi Kishan Mariyala · Answer 1 · 2014-04-20T18:43:00

The problem is in below line of code

MailBLOB = CType(TableContainer.Rows(0).Item(0), Byte())

Is there any specific reason why you are converting to byte. What are you trying to do with MailBLOB object. I do not see any further code which explains why MailBLOB is used. If it is not used for any specific purpose then you can keep MailBLOB as string itself.

After looking at your comments, first you can convert the mailblob to byte data using getbytes method

http://www.techrepublic.com/blog/software-engineer/convert-a-string-into-a-byte-array-in-vbnet/#.[^]

This way you can save data to db. Then to fetch the data you can use below conversion

C#

Byte[] byteBLOBData = new Byte[0];
byteBLOBData = (Byte[])(row["DOCLIST"]);
String s = System.Text.Encoding.UTF8.GetString(byteBLOBData);

Sandeep Singh Shekhawat · Answer 2 · 2014-04-16T18:19:00

Hi,

It would be good if you post your code where you got stuck.

There are few similar thread:

how to give a message alert box in asp.net ?[^]

Unable to cast object of type 'System.String' to type 'System.Byte[]'.[^]

Unable to cast object of type 'System.String' to type 'System.Byte[]'. Exception[^]

Unable to cast object of type 'System.String' to type 'System.Byte[]'[^]

http://stackoverflow.com/questions/19358883/unable-to-cast-object-of-type-system-byte-to-type-system-string[^]

http://stackoverflow.com/questions/17769137/unable-to-cast-object-of-type-system-byte-to-type-system-string[^]

I got the ERROR while run my page

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