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File download from GridView rows in ASP.NET 4.0

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4.91 (16 votes)
2 May 2013CPOL
There will be one Link button in the GridView row. On clicking the Link button, the Image displayed in that row gets downloaded.
In .aspx page:
  • Inside columns tag, add one template field like below:
<asp:TemplateField HeaderText="Screen Shot">
    <ItemTemplate>
         <asp:Image ID="screenShot" runat="server" ImageUrl='<%# Eval("screenshot") %>' CssClass="image" AlternateText="No Screenshots available"/>
         <asp:LinkButton ID="lnkDownload" runat="server" CommandArgument='<%# Eval("screenshot") %>' CommandName="cmd">Download</asp:LinkButton>
   </ItemTemplate>
</asp:TemplateField>
  • Add one OnRowCommand="GridView1_RowCommand" event inside
    <asp:GridView tag.
In .cs page:
  • Define the event "GridView1_RowCommand" as follows:
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) {
 
   if (e.CommandName == "cmd")
   {
      string filename = e.CommandArgument.ToString();
      if (filename != "")
      {
         string path = MapPath(filename);
         byte[] bts = System.IO.File.ReadAllBytes(path);
         Response.Clear();
         Response.ClearHeaders();
         Response.AddHeader("Content-Type", "Application/octet-stream");
         Response.AddHeader("Content-Length", bts.Length.ToString());
 
         Response.AddHeader("Content-Disposition", "attachment;   filename=" + filename);
 
         Response.BinaryWrite(bts);
 
         Response.Flush();
 
         Response.End();
      }
   } 
}

Important Points

  • Example is given for Image download, but you can download files of any type by just giving the path in "CommandArgument" attribute
  • Q: What is ImageUrl='' ???
  • A: It is written to specify/evaluate the path of image that we got from dataset(column name in dataset is "screenshot").
  • Q: What is CommandArgument='' ???
  • A: Again CommandArgument takes the ImageUrl which is obtained from the dataset.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)
Software Developer Mindfire Solutions
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Comments and Discussions

 
GeneralMy vote of 5 Pin
Sibeesh KV13-Nov-14 3:14
professionalSibeesh KV13-Nov-14 3:14 
GeneralRe: My vote of 5 Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)13-Nov-14 3:29
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)13-Nov-14 3:29 
GeneralRe: My vote of 5 Pin
Sibeesh KV13-Nov-14 3:35
professionalSibeesh KV13-Nov-14 3:35 
GeneralMy vote of 5 Pin
Tom Marvolo Riddle29-Jan-14 19:19
professionalTom Marvolo Riddle29-Jan-14 19:19 
GeneralRe: My vote of 5 Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)29-Jan-14 19:21
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)29-Jan-14 19:21 
GeneralMy vote of 5 Pin
Debopam Pal18-Nov-13 15:32
professionalDebopam Pal18-Nov-13 15:32 
GeneralRe: My vote of 5 Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)18-Nov-13 18:58
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)18-Nov-13 18:58 
GeneralMy vote of 5 Pin
Michael Haephrati23-Feb-13 1:11
mvpMichael Haephrati23-Feb-13 1:11 
GeneralRe: My vote of 5 Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)23-Feb-13 1:20
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)23-Feb-13 1:20 
QuestionNice one Pin
Mr. Tapan Kumar20-Sep-12 2:04
memberMr. Tapan Kumar20-Sep-12 2:04 
AnswerRe: Nice one Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)20-Sep-12 2:07
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)20-Sep-12 2:07 
GeneralMy vote of 5 Pin
Pro Idiot6-Aug-12 1:52
memberPro Idiot6-Aug-12 1:52 
GeneralRe: My vote of 5 Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)6-Aug-12 1:53
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)6-Aug-12 1:53 
Questionhow can i view file with a hyper link? Pin
praveen_t_s30-Jun-12 20:39
memberpraveen_t_s30-Jun-12 20:39 
GeneralRe: how can i view file with a hyper link? Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)3-Jul-12 21:54
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)3-Jul-12 21:54 
Questionhow do i add hyperlink to show a document from grid view? Pin
praveen_t_s30-Jun-12 19:59
memberpraveen_t_s30-Jun-12 19:59 
AnswerRe: how do i add hyperlink to show a document from grid view? Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)3-Jul-12 20:43
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)3-Jul-12 20:43 
GeneralMy vote of 5 Pin
Srinivasaprabhu.N19-Apr-12 4:47
memberSrinivasaprabhu.N19-Apr-12 4:47 
GeneralRe: My vote of 5 Pin
Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)9-Jun-12 3:08
protectorTadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)9-Jun-12 3:08 

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Posted 18 Jan 2012

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