<form id="Form1" method="post" runat="server" enctype="multipart/form-data">
				
<input id="filMyFile" type="file" runat="server">
<asp:button id="cmdSend" runat="server" Text="Send"/>

</form>

private void cmdSend_Click(object sender, System.EventArgs e)
		{
			// Check to see if file was uploaded
			if( filMyFile.PostedFile != null )
			{
				// Get a reference to PostedFile object
				HttpPostedFile myFile = filMyFile.PostedFile;

				// Get size of uploaded file
				int nFileLen = myFile.ContentLength; 

				// make sure the size of the file is > 0
				if( nFileLen > 0 )
				{
					// Allocate a buffer for reading of the file
					byte[] myData = new byte[nFileLen];

					// Read uploaded file from the Stream
					myFile.InputStream.Read(myData, 0, nFileLen);

					// Create a name for the file to store
					string strFilename = Path.GetFileName(myFile.FileName);
					
				}
			}
		}