How to download the file from the database

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Dear All

This is the code I have used in my page to download the file from the database. I have stored in the varbinary format. When i clicked the linkbutton , the file has to open.but I'm getting the javscript error. Please help me to sort out this.

byte[] fileData =(byte[])ds.Tables[0].Rows[0][3];
            Response.ClearContent();
            Response.AddHeader("Content-Disposition", "attachment; filename=1.xls"); // + ds.Tables[0].Rows[0][2]);
            System.IO.BinaryWriter bw = new System.IO.BinaryWriter(Response.OutputStream);
            bw.Write(fileData);
            bw.Close();
            Response.ContentType =ds.Tables[0].Rows[0][4].ToString()  ;
            Response.End();

The problem is that fileupload control kept inside the ajax updatepanel control. Now its working when I placed the control outside of the panel. But I need to know what's the reason.

Regards
Sheik

Posted 23-Nov-11 2:49am

shek124

Updated 29-Nov-11 22:57pm

v2

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thatraja 23-Nov-11 11:56am

Always mention the error messages in your question.
:(

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GenJerDan · Answer 1 · 2011-11-23T04:03:00

What javascript error?

This is how I have done it in the past, with no errors:

byte[] fileData =(byte[])ds.Tables[0].Rows[0][3];
HttpContext context = HttpContext.Current;
context.Response.Clear();
context.Response.ClearContent();
context.Response.ClearHeaders();
context.Response.Buffer = true;
context.Response.ContentType = ds.Tables[0].Rows[0][4].ToString()  ;
context.Response.AppendHeader("Content-Disposition", "attachment; filename=1.xls");
context.Response.AppendHeader("content-length", filedata.Length.ToString());
context.Response.BinaryWrite(filedata);
context.Response.Flush();
context.Response.End();

(Looking at it now, I think the ClearContent and ClearHeaders might be redundant after the Clear. :-p )

thatraja · Answer 2 · 2011-11-23T06:18:00

Solution 2

You didn't provide complete details in your question. Already answered a similar question here before in Q/A section, check it.

Save and Retrieve Files from Database[^]

Posted 23-Nov-11 6:18am

thatraja

Prince Antony G · Answer 3 · 2011-11-30T00:25:00

C#

string style = @"<style> .text { mso-number-format:\@; } </style> ";
GridView1.Visible = true;
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition",
"attachment;filename=file.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
//GridView1.RenderControl(hw);
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();

C#

public override void VerifyRenderingInServerForm(Control GridView1)
  {

      /* Verifies that the control is rendered */

  }

How to download the file from the database

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