Problem playing video

protected void btnSub_Click(object sender, EventArgs e)
   {
       try
       {
           UploadVideo obj = new UploadVideo();
           string filename = fuUploadVideo.FileName;
           string path = Server.MapPath("Uploads4");
           string strFinalFileName = Path.GetFileName(fuUploadVideo.FileName);
           long FileLength = fuUploadVideo.PostedFile.ContentLength;
           long uploadchunklimit;
           int SizeLimit = (int)FileLength;
           if (FileLength <= 1024)
           {
               uploadchunklimit = 1;
               SizeLimit = (int)FileLength;
           }
           else if (FileLength > 1024)
           {
               uploadchunklimit = FileLength / 1024;
               SizeLimit = 10;
           }
           else if (FileLength <= 10240 && FileLength > 1024)
           {
               uploadchunklimit = FileLength / 1024;
           }
           else
           {
               uploadchunklimit = FileLength / 1024;
           }

           long lngSize = (long)SizeLimit;
           lngSize = 1024 * 1024;
           string ext = Path.GetExtension(fuUploadVideo.PostedFile.FileName);

           fuUploadVideo.PostedFile.SaveAs(Server.MapPath("~\\Uploads4\\" + filename));
           path = "~\\Uploads4\\" + filename;
           SqlConnection con = new SqlConnection(str);
           lblinfo.Text = " uploaded successfully ";
           cmd = new SqlCommand("Insert into electronicmedia(Video_Name,url) values(@Video,'" + path + "')", con);
           cmd.Parameters.AddWithValue("Video", TextBox2.Text);
           cmd.CommandType = CommandType.Text;
           con.Open();
           cmd.ExecuteNonQuery();
           con.Close();
       }
       catch (Exception ex)
       {
           Response.Write(ex.ToString());
       }
       }