HOW to use FileUpload control | Upload file in asp.net

Introducation :- 

With ASP.NET, accepting file uploads from users has become extremely easy. With the FileUpload control, it can be done with a small amount of code lines, as you will see in the following example. However, please notice that there are security concerns to to consider when accepting files from users! Here is the markup required:

 <form id="form1" runat="server">  
   <asp:FileUpload id="FileUploadControl" runat="server" />  
   <asp:Button runat="server" id="UploadButton" text="Upload" onclick="UploadButton_Click" />  
   <br /><br />  
   <asp:Label runat="server" id="StatusLabel" text="Upload status: " />  
 </form>  

And here is the CodeBehind code required to handle the upload:

 protected void UploadButton_Click(object sender, EventArgs e)  
 {  
   if(FileUploadControl.HasFile)  
   {  
     try  
     {  
       string filename = Path.GetFileName(FileUploadControl.FileName);  
       FileUploadControl.SaveAs(Server.MapPath("~/") + filename);  
       StatusLabel.Text = "Upload status: File uploaded!";  
     }  
     catch(Exception ex)  
     {  
       StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;  
     }  
   }  
 }  

Hope it will help you.......