Asp.net C# code for download file

  protected void DownloadFile(string Path, string FileName)  
   {  
     try  
     {  
       string strURL = Path;  
       WebClient req = new WebClient();  
       HttpResponse response = HttpContext.Current.Response;  
       response.Clear();  
       response.ClearContent();  
       response.ClearHeaders();  
       response.Buffer = true;  
       response.AddHeader("Content-Disposition", "attachment;filename="+FileName);  
       byte[] data = req.DownloadData(Server.MapPath(strURL));  
       response.BinaryWrite(data);  
       response.End();  
     }  
     catch (Exception ex)  
     {  
     }  
   }  

Check all Check boxes in a check box list ASP.NET + Jquery

Design

 <asp:CheckBox ID="checkAllImport" runat="server" AutoPostBack="false" Text="Select All" />  
         <asp:CheckBoxList ID="chkOptions" runat="server" RepeatColumns="5" RepeatDirection="Horizontal"></asp:CheckBoxList>  

Script

  <script type="text/javascript">  
     $(document).ready(function() {  
     $("#<%=checkAllImport.ClientID %>").change(function() {  
     $("input[id *='chkOptions']").prop("checked", this.checked);  
     })  
     });  
   </script>  

Sorting rows in a data table C#

Create a new DataTable from a DataView that you create from your original DataTable. 
Apply whatever sorts and/or filters you want on the DataView and then create a new DataTable from the DataView using the DataView.ToTable method

 DataView dv = ft.DefaultView;  
 dv.Sort = "occr desc";  
 DataTable sortedDT = dv.ToTable();  

How to stop IIS asking authentication for default website on localhost

IIS uses Integrated Authentication and by default IE has the ability to use your windows user account...but don't worry, so does Firefox but you'll have to make a quick configuration change.

1) Open up Firefox and type in about:config as the url

2) In the Filter Type in ntlm

3) Double click "network.automatic-ntlm-auth.trusted-uris" and type in localhost and hit enter