Convert data string to byte[]

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hi..
how to convert data string to byte[]. i doing downloading file in c#. but i got an error cannot implicit convert type 'string' to 'byte[]' how can i solve this problem...

this is my sample coding

C#

string filename = filename;

           Byte[] bytes = attachment;
           try
           {
               Response.Clear();
               Response.AddHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
               Response.AddHeader("Content-Length", bytes.Length.ToString());
               Response.ContentType = "application/octet-stream";
               Response.BinaryWrite(bytes);
               Response.Flush();
           }
           catch (Exception ex)
           {
               Response.ContentType = "text/plain";
               Response.Write(ex.Message);
           }
           finally
           {
               Response.End();
           }

i got an error at Byte[] bytes = attachment

Thanks in advance

Posted 9-Feb-13 1:59am

NaniCh

Updated 9-Feb-13 2:10am

v5

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3 solutions

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OriginalGriff · Answer 1 · 2013-02-09T02:04:00

Solution 1

string to byte[]:

C#

string s = ...
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(s);

Depending on what your file was written with, you may want to use one of the other Encoding options instead of ASCII. Unicode, UTF7 or UTF8 perhaps.

Posted 9-Feb-13 2:04am

OriginalGriff

Thomas Daniels · Answer 2 · 2013-02-09T02:06:00

Hi,

Use the Encoding.GetBytes Method[^]

C#

byte[] array = Encoding.yourEncoding.GetBytes(stringData);

Change yourEncoding into the encoding you want to use.
For example:

C#

byte[] array = Encoding.UTF8.GetBytes(stringData);

Another way:

C#

byte[] array = Encoding.GetEncoding("encodingName").GetBytes(stringData);

For example:

C#

byte[] array = Encoding.GetEncoding("utf-32").GetBytes(stringData);

Hope this helps.

swapymore_01 · Answer 3 · 2013-02-10T22:47:00

Solution 3

write
byte[] bytes = attachment;

Posted 10-Feb-13 22:47pm

swapymore_01