How to download a file using datalist in asp.net

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i want to download a file from a folder using image button of datalist where datalist contains some item which are coming from data base.For every item there are different file which are placed in a folder in my solution, now i want to download by clicking the respective item image button. Please help.

thanks in advance :) .

Dhananjay Kumar · Answer

You need to give the file path of download file to Button. You can bind the file path to CommandArgument of button then handle its Click event or ItemCommand event of DataList to do downloading. protected void DataList1_ItemCommand(object sender DataListCommandEventArgs e) { if (e.CommandName == download) { string file = e.CommandArgument.ToString(); DownloadFile(file); } } protected void DownloadFile(string filepath) { System.IO.Stream iStream = null; // Buffer to read 10K bytes in chunk: byte[] buffer = new Byte[10000]; // Length of the file: int length; // Total bytes to read: long dataToRead; // Identify the file name. string filename = System.IO.Path.GetFileName(filepath); try { // Open the file. iStream = new System.IO.FileStream(filepath System.IO.FileMode.Open System.IO.FileAccess.Read System.IO.FileShare.Read); // Total bytes to read: dataToRead = iStream.Length; Response.ContentType = application/octet-stream; Response.AddHeader(Content-Disposition inline; filename= + filename); // Read the bytes. while (dataToRead > 0) { // Verify that the client is connected. if (Response.IsClientConnected) { // Read the data in buffer. length = iStream.Read(buffer 0 10000); // Write the data to the current output stream. Response.OutputStream.Write(buffer 0 length); // Flush the data to the HTML output. Response.Flush(); buffer = new Byte[10000]; dataToRead = dataToRead - length; } else { //prevent infinite loop if user disconnects dataToRead = -1; } } } catch (Exception ex) { // Trap the error if any. Response.Write(Error :  + ex.Message); } finally { if (iStream != null) { //Close the file. iStream.Close(); } } }