how to set image url in gridview

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I have use following code:

XML

<asp:TemplateField HeaderText="Attachment"  ItemStyle-VerticalAlign="Middle" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <asp:LinkButton runat="server" ID="likattachment"  CommandName="download" CommandArgument='<%#Eval("attachment") %>'>
                <img src="../icon/paper-clip.png" style="border:0px;" id="image1" />

                </asp:LinkButton>
           </ItemTemplate>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
            </asp:TemplateField

and on rowcommand event I have use following code:

C#

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        try
        {
            LinkButton lik = (LinkButton)e.CommandSource;
            if (lik.CommandName == "download")
            {
                string filename = "" + e.CommandArgument;
                if (!string.IsNullOrEmpty(filename))
                {
                    Response.Clear();
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
                    // Response.AddHeader("Content-Length", file.Length.ToString());
                    Response.ContentType = "plain/text";
                    Response.TransmitFile(Server.MapPath("~/upload/" + filename));

                }
                else
                {
                    Response.Write("<script>alert('No Attachment to download');</script>");
                }

            }
        }
        catch(Exception ex)
        {
        }
    }

Now I want to display default image icon for those records which has no image in attachment.. Also records with attachment display in list but with different icon..
I think it will done by RowDataBound event of gridview I tried but my problem is not solved
Plz suggest me what should do..
Thanks in advance..

Posted 9-Feb-14 23:51pm

heta.dave

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2014-02-10T01:45:00

Try the below code...

Add OnRowDataBound="GridView1_RowDataBound" to GridView Markup in aspx Page.

Define the Event in Code Behind page.

C#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    LinkButton lnkAttachment = (LinkButton)e.Row.FindControl("likattachment");

    if (!string.IsNullOrEmpty(lnkAttachment.CommandArgument.ToString())
    {
        // Attachment exists, do something.
    }
    else
    {
        // No Attachments, show icon
    }
}

JoCodes · Answer 2 · 2014-02-10T03:32:00

Solution 2

Other option can be using Ternary Operator, Something like

ImageUrl='<%# Eval("attachment")!=null ? "~/Images/Attachment.gif" : "~/Images/NoAttachment.gif"%>'

Posted 10-Feb-14 3:32am

JoCodes

v2