How to retrieve file extension of uploaded file?

i have uploaded the docx, pdf and jpg file using fileupload.i designed a update form.
Now i wanted to update the new file with the existing file.how to achieve it?how to retrieve the selected files?

The below is my insertion Part:
//Insertion
if (fu_press.HasFile)
{
string ext = System.IO.Path.GetExtension(fu_press.FileName);
press = userId + "press" + ext;
fileLocation1 = Server.MapPath("images/Media/press_release/" + press);
fu_press.SaveAs(fileLocation1);
fileTxt = "1";
}
else
{
press = txtpress.Text;
}


if (fu_browsher.HasFile)
{
string ext = System.IO.Path.GetExtension(fu_browsher.FileName);
browname = userId + "broshure" + ext;
fileLocation2 = Server.MapPath("images/Media/Brouchure/" + browname);
fu_browsher.SaveAs(fileLocation2);

}
if (fu_pimg1.HasFile)
{
string ext = System.IO.Path.GetExtension(fu_pimg1.FileName);
pimg1name = userId + "prod1" + ext;
fileLocation3 = Server.MapPath("images/Media/products/" + pimg1name);
fu_pimg1.SaveAs(fileLocation3);

}
.....
...
string connectStr = ConfigurationManager.ConnectionStrings["ExpoExhibitorConnectionString"].ToString();
connect = new MySqlConnection(connectStr);
string queryStr = "insert into exb_mediainfo(title,press_release,product_imgs1,product_imgs2,product_imgs3,browsher,user_id,date,press_filetype,logo) values(?title,?press,?prod1,?prod2,?prod3,?browsher,?uid,?date,?filetype,?logo)";
connect.Open();
MySqlTransaction transaction = connect.BeginTransaction();

MySqlCommand command1 = new MySqlCommand(queryStr, connect, transaction);
command1.Parameters.AddWithValue("?title", txtitle.Text);
command1.Parameters.AddWithValue("?press", press);
command1.Parameters.AddWithValue("?prod1", pimg1name);
command1.Parameters.AddWithValue("?prod2", img2);
command1.Parameters.AddWithValue("?prod3", img3);
command1.Parameters.AddWithValue("?browsher", browname);
command1.Parameters.AddWithValue("?uid", userId);
command1.Parameters.AddWithValue("?date", todaydate);
command1.Parameters.AddWithValue("?filetype", fileTxt);
command1.Parameters.AddWithValue("?logo", logo);
command1.ExecuteNonQuery();
...
...
}


I inserted the data into the table Now i wanted to retrieve the inserted part into update form.i wanted to retrieve the selected file(fileupload).The below is the code for update:

///update:i am retrieving the values from the database

if (dt.Rows.Count > 0)
{
txtitle.Text= dt.Rows[0]["title"].ToString();
string content;
string contentb;
string contentp1;
string contentp2;
string contentp3;
string contentlogo;
string queryStr = "";
if (dt.Rows[0]["press_filetype"].ToString() == "0")
{
txtpress.Text= dt.Rows[0]["press_release"].ToString();
}
else
{
content = "http://expocrm.expogroup.info/images/Media/press_release/" + dt.Rows[0]["press_release"].ToString();

}
contentb = "http://expocrm.expogroup.info/images/Media/Brouchure/" + dt.Rows[0]["browsher"].ToString();
contentp1= "http://expocrm.expogroup.info/images/Media/products/" + dt.Rows[0]["product_imgs1"].ToString();
if (dt.Rows[0]["product_imgs2"].ToString() != "N/A")
{
contentp2 = "http://expocrm.expogroup.info/images/Media/products/" + dt.Rows[0]["product_imgs2"].ToString();
}
else
{
contentp2 = dt.Rows[0]["product_imgs2"].ToString();
}

if (dt.Rows[0]["product_imgs3"].ToString() != "N/A")
{
contentp3 = "http://expocrm.expogroup.info/images/Media/products/" + dt.Rows[0]["product_imgs3"].ToString();
}
else
{
contentp3 = dt.Rows[0]["product_imgs3"].ToString();
}
if (dt.Rows[0]["logo"].ToString() != "")
{
contentlogo = "http://expocrm.expogroup.info/images/Media/logos/" + dt.Rows[0]["logo"].ToString();

}
else
{
contentlogo = "N/A";
}

...
...
...




}
}
catch (Exception ex) { }
finally
{
if (connect.State == ConnectionState.Open)
{
connect.Close();
}
}


Any help will be highly appreciated.

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