• Create design code

       <asp:FileUpload ID="filUpload" runat="server" />
        <asp:Button ID="cmdUpload" runat="server" OnClick="cmdUpload_Click" Text="Upload" />

• Server Side Code:

 protected void cmdUpload_Click(object sender, EventArgs e)
    {
        if (filUpload.PostedFile != null && filUpload.PostedFile.ContentLength > 0)
        {
            byte[] bData = new byte[filUpload.PostedFile.ContentLength];
            filUpload.PostedFile.InputStream.Read(bData, 0, filUpload.PostedFile.ContentLength);

            //Retrieve filename
            System.IO.FileInfo oInfo = new System.IO.FileInfo(filUpload.PostedFile.FileName);
           
        }
    }

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