Hash URL in SQL

I try to hash URL (video path) that I uploaded to SQL data base I use this code to create path of video
//Upload converted video, and the corresponding information stored in the database protected void btnUpVideo_Click(object sender, EventArgs e) { ClientScriptManager cs = Page.ClientScript; //Get the name of the uploaded file string upFileName = fileupVideo.FileName; //Determine whether a file is selected if (this.fileupVideo.HasFile) { //Get the file extension string upExtension = upFileName.Substring(upFileName.LastIndexOf(".") + 1); //Judgment that the extension is correct if (checkExtension(upExtension)) { //Access to upload files saved path string upFilePath = Server.MapPath("../upFile/") + upFileName; //Save the file to the specified path fileupVide ...