How to open a pdf file in a WebForm application by search?

Question

When I click on the listbox which search a PDF file, it\'s not opening.

The code is below. Any thoughts?

protected void Button1_Click(object sender, Even         


        

Answer 1

First, you must save the file's full name to get it later. So, you must change from:

ListBox1.Items.Add(Path.GetFileName(file));

To:

ListBox1.Items.Add(new ListItem(Path.GetFileName(file), file));

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Then, you should send the file from the server to the client, like this:

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    string fileName = ListBox1.SelectedValue;
    byte[] fileBytes = System.IO.File.ReadAllBytes(fileName);

    System.Web.HttpContext context = System.Web.HttpContext.Current;
    context.Response.Clear();
    context.Response.ClearHeaders();
    context.Response.ClearContent();
    context.Response.AppendHeader("content-length", fileBytes.Length.ToString());
    context.Response.ContentType = "application/pdf";
    context.Response.AppendHeader("content-disposition", "attachment; filename=" + fileName);
    context.Response.BinaryWrite(fileBytes);
    context.ApplicationInstance.CompleteRequest();
}

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Note: don't forget to initialize your ListBox with the property AutoPostBack setted to true.