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Asp.net server side check to check file extension uploaded and file size

Here is the code :

if (FileUpload1.HasFile)
                {
                    if (((System.IO.Path.GetExtension(FileUpload1.FileName)) == ".pdf" || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".zip") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".rar") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".xlsx") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".xls") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".doc") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".docx")) && FileUpload1.PostedFile.ContentLength < 20480000)
                    {
                        check = true;
                    }
                    else
                    {
                        check = false;
                        if (!((System.IO.Path.GetExtension(FileUpload1.FileName)) == ".pdf" || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".zip") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".rar") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".xlsx") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".xls") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".doc") || (System.IO.Path.GetExtension(FileUpload1.FileName) == ".docx")))
                        {
                            DisplayAJAXMessage("Only .zip, .pdf, .rar, .xlsx, .xls, .doc, .docx file is allowed !!");
                        }
                        else
                        {
                            DisplayAJAXMessage("File Size is :" + ((FileUpload1.PostedFile.ContentLength / 1000) / 1024).ToString() + "MB !! Only size upto 20 MB is allowed");
                        }
                    }

                    if (check == true)
                    {
// here you can upload as per you need
}

    public void DisplayAJAXMessage(string msg)
    {
        Control page = this;
        string myScript = String.Format("alert('{0}');", msg);
        ScriptManager.RegisterStartupScript(page, page.GetType(), "MyScript", myScript, true);
    }

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