Fileuplaod in asp.net

Hi,

 

I have file uplaod and button, but when I am selecting a image and click on button on my code behind file name is coming blank----

 

 

*Logo


 

 

 

 

 

 

 protected void btn_comp_submit_Click(object sender, EventArgs e)
{
try
{
if ((FileUpload1.FileName != ""))
{
byte[] raw;

string extension = Path.GetExtension(FileUpload1.PostedFile.FileName);
if (((extension == ".jpg") || ((extension == ".gif") || (extension == ".png"))))
{
FileStream fs = new FileStream(FileUpload1.PostedFile.FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
raw = new byte[fs.Length];
fs.Read(raw, 0, Convert.ToInt32(fs.Length));

...................................................................................

 

Please tell me the prob, Ihave used file upload before also but never faced this type of issue.