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
.