in this if the user upload the files and again it will move into loop but again its asking to insert the files check what property to check whether the file is updated..

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C#

if (f == true && flupload.FileName == null)
        {

            ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('Please select a File to upload');",true);
        }
        else
        {
         //code to process the executed files

}


in this if the user upload the files and again it will move into loop but again its asking to insert the files check what property to check whether the file is updated..