ASP.NET code for downloading files.

First create a DataGrid in your asp designer page. Add a Hyper link field to which files to be associated with  & all other setting as bellow.

<asp:DataGrid ID="fileload" runat="server" AutoGenerateColumns="False">

        <Columns>

            <asp:HyperLinkColumn DataNavigateUrlField="Name"

                DataNavigateUrlFormatString="FetchFile.aspx?FileName={0}" DataTextField="Name"

                HeaderText="File Name:" SortExpression="Name"></asp:HyperLinkColumn>

        </Columns>

   

    </asp:DataGrid>

Look above, in order fetch files from the directory another asp page fetch.aspx is refered in the DataNavigateUrlFormatString of the hyperlink column field. So create another asp page as ‘FetchFile.aspx’  & add the following code in the page load event.

string dlDir = "downloadfiles/";

        string strFilename = Request.QueryString["Filename"];

        string path=Server.MapPath(dlDir+strFilename);

        System.IO.FileInfo toDownload = new FileInfo(path);

        if (toDownload.Exists)

        {

            Response.Clear();

            Response.AddHeader("Content-Disposition", "attachment;filename=" + toDownload.Name);

            Response.AddHeader("Content-Length", toDownload.Length.ToString());

            Response.ContentType = "application/octet-stream";

            Response.WriteFile(toDownload.FullName);

            Response.End();

        }

Then come into the main asp coding page where DataGrid was created earlier & write the following code into the page loade event.

string folder = Server.MapPath("downloadfiles/");

        //Get the files by using directoryInfo class of system.IO assembly

        DirectoryInfo di = new DirectoryInfo(folder);

        FileInfo[] fri = di.GetFiles();

        int countfile = fri.Count();

        //Create a table & bind the file names into cells.

        System.Data.DataTable table = new System.Data.DataTable();

        DataColumn column;

        DataRow row;

        column = new DataColumn();

        column.ColumnName = "Name";

        column.DataType = System.Type.GetType("System.String");

        table.Columns.Add(column);

       

        for (int i = 0; i <countfile; i++)

        {

            row = table.NewRow();

            row["Name"] = fri[i].Name.ToString();

            table.Rows.Add(row);

        }

        //bind the table data to the data grid in designer page

        fileload.DataSource = table;

        fileload.DataBind();
build the solution & run your main asp page. Your Data Grid will be filled with the downloadable file lists. Click any file among of them & watch your downloading.