saving file with FileStream with save file prompt, using sql server

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Im trying to save a file from sql server database table fields are(FileID, FileName, ContentType, FileData) and cant seem to use FileStream without specifying a local path.

this is my method to retrieve the file, but it requires a local path not IIS...

private void Download(DataTable dt)
    {
        Byte[] bytes = (Byte[])dt.Rows[0]["FileData"];
        string fileName = dt.Rows[0]["FileName"].ToString();
        
        FileStream fs =
            new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write);

        BinaryWriter bw = new BinaryWriter(fs);       
        
        bw.Write(bytes, 0, bytes.Length);
        bw.Close();
        bw.Flush();
        
        fs.Close();

        Response.ClearContent();
        Response.Clear();
        Response.ContentType = dt.Rows[0]["ContentType"].ToString();
        Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
        Response.TransmitFile(fileName);
        Response.Write(fs);

        Response.Flush();
        Response.End();

Any help would be greatly appreciated.Thanks in advance!

Posted 1-Jun-14 21:44pm

nebiam

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DamithSL · Accepted Answer · 2014-06-01T21:50:00

Solution 1

C#

Byte[] bytes = (Byte[])dt.Rows[0]["FileData"];
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = dt.Rows[0]["ContentType"].ToString();
Response.AddHeader("content-disposition", "attachment;filename="
                + dt.Rows[0]["FileName"].ToString());
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();

Posted 1-Jun-14 21:50pm

DamithSL

Comments

nebiam 2-Jun-14 3:57am

I have tried this, and no popup "save as" dialogue appears. It actually does nothing. Stepping through it returns the content type and filename ect..

nebiam 3-Jun-14 21:07pm

This infact works perfectly! I had the control (repeater) nested in an update panel.. which is why it would not work to begin with. In fact both blocks of code posted will work. To get the code working in an update panel, i added a trigger for the control to the update panel.

<Triggers>
<asp:PostBackTrigger ControlID="ControlID" />
</Triggers>